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Réponse:

7x + 10 - 2x = 2x + 35 - 2x

5x + 10 = 35

5x + 10 - 10 = 35 - 10

5x = 25

5x / 5 = 25 / 5

1x = 5

x = 5

Réponse :

9x - 12 = 3x + 6

9x - 3x  = 12+6

6x = 18

x = 18/6

x= 3

7x + 10 - 2x = 2x + 35 - 2x

5x + 10 = 35

5x + 10 - 10 = 35 - 10

5x = 25

5x / 5 = 25 / 5

1x = 5

x = 5