8EQUAÇÃO DO PRIMEIRO GRAU

8x − 3x = 10 55x = 15

x =155

x = 3

5x − 7x = 4 − 8−2x = −4

x =42

x = 2

x = 123

x = 4

6x = 36

x =366

x = 6

2x = −8

x = −82

x = −4

3x = 3 6

x =93

x = 3

7x = 28

x =287

x = 4

01 0203

04 05 06 07

2x = 3

x =32

3x x = −9 254x = 16

x =164

x = 4

08 09 10

5x − 2x = 4 53x = 9

x =93

x = 3

2x − 4x = 3 − 5−2x = −2

x =22

x = 1

11 2x − 3x = −4 − 3−x = −7x = 7

12

4x − 4 = 2x 84x − 2x = 8 4

2x = 12 2 =122

x = 6

13

6x − 15 16 − 4x = 06x − 4x = −16 152x = −1

x = −12

3x − 12 = 03x = 12

x =123

x = 4

15

2x − 6 = −3x 92x 3x = 9 65x = 15

x =155

x = 3

14

163x − 4 = 2x 63x − 2x = 6 4x = 10

17

10 6x = 5x 156x − 5x = 15 − 10x = 5

6x 6 − 5x − 10 − 6 = 06x − 5x = 5x − 6 10 6x = 10

18 19

7x − 21 = 9x 9 − 387x − 9x = 9 − 38 21−2x = −8

x =82

x = 4

5x − 15 − 4x − 8 = 1 − 5x5x − 4x 5x = 1 15 86x = 24

x =246

x = 4

20 21

5x 5 6x 12 = 9x 275x 6x − 9x = 27 − 5 − 122x = 10

x =102

x = 5

20x − 12 − 192 64x − 36x 12 = 9620x 64x − 36x = 96 12 192 − 1248x = 288

x =28848

x = 6

22 23

10x 50 8x 32 = 5x 65 12110x 8x − 5x = 65 121 − 50 − 3213x = 104

x =28848

x = 8

24

6x − 4x = 6x − 66x − 4x − 6x = −64x = 6

x =64

x = 32

25

2x 2 3x 6 = 482x 3x = 48 − 2 − 65x = 40

x =405

x = 8

266x 4x − 3x = 1687x = 168

x =1687

x = 24

3x − 10x = −147x = 14

x =147

x = 2

4x 2x 3x = 729x = 72

x =729

x = 8

27

28 29

14x 8 − 10x = 15x − 2514x − 10x − 15x = −25 − 811x = 33

x =3311

x = 3

3x 2x = 14 4x3x 2x − 4x = 14x = 1430 31

32

8x − 12 − 18x − 48 = 8x − 36 − 3x − 128x − 12 − 18x 48 = 8x − 36 − 3x 128x − 18x − 8x 3x = −36 12 12 − 48−15x = −60

x = 6015

x = 4

144x − 225x 3.240 = 80x − 20144x − 225x − 80x = −20 − 3.240−161x = −3.220

x =3.220161

x = 20

33

9x 3 − 4x = 60 x − 19x − 4x − x = 60 − 1 − 34x = 56

x =564

x = 14

34

9x − 6 − 24 − 6x = 24x − 28x − 89x − 6 − 24 6x = 24x − 28x 89x 6x − 24x 28x = 8 6 2419x = 38

x = 3819

x = 2

35

4x 8 − 3x − 9 = 12x − 24 − 6x − 64x 8 − 3x 9 = 12x − 24 − 6x 64x − 3x − 12x 6x = −24 6 − 8 − 9−5x = −35

x = 355

x = 7

36