Verified answer

Bonsoir,

a. 7a - 8 = 3a + 7

7a - 3a = 8 + 7

4a = 15

a = 15 / 4 = 3,75

b. -2a + 3 = 14a - 1

-2a - 14a = -3 + -1

-16a = -4

a = -4 / -16 = 0,25

c. Je te laisse terminer.

Verified answer

Bonsoir

Résoudre :

a) 7a - 8 = 3a + 7

7a - 8 - 3a = 3a + 7 - 3a

4a - 8 + 8 = 7 + 8

4a = 15

b) -2a + 3 = 14a - 1

-2a + 3 + 2a + 1 = 14a - 1 + 2a + 1

4 = 16a

c) 3a - 4 = -5a - 8

3a - 4 + 5a + 4 = -5a - 8 + 5a + 4

8a = -4

d) 7a - 6 = 9a - 11

7a - 6 - 7a + 11 = 9a - 11 - 7a + 11

5 = 2a