Bonsoir
a. 5x - 7 = 8
5x = 8 + 7
5x = 15
x = 15/5
x = 3
b. - 2 = 18 + 10y
10y = - 2 - 18
10y = - 20
y = - 20/10
y = - 2
c. 7 + 9y = - 29
9y = - 29 - 7
9y = - 36
y = - 36/9
y = - 4.
d. 3 (x - 1) = 3
3x - 3 = 3
3x = 3 + 3
3x = 6
x = 6/3
x = 2
e. 12 - 6x = 3/2
- 6x = 3/2 - 12
- 6x = 3/2 - 24/2
- 12x/2 = 3/2 - 24/2
- 12x = 3 - 24
- 12x = - 21
x = 21/12
f. 5/3x + 1/5 = 2/3x - 1/5
5/3x - 2/3x = - 1/5 - 1/5
3/3x = - 2/5
x = - 2/5.
