Question a et question b

5 - 4(3 - 2x) = - 2
5 - 12 + 8x = - 2
8x = - 2 - 5 + 12
8x = 5
x = 5/8

S= {5/8}

2 + (- 3)/(1 - 5x) = 4                            avec x ≠ 1/5
2 + (- 3)/(1 - 5x) - 4 = 0
- 2 - 3/(1 - 5x) = 0
- 2 + 3/(5x - 1) = 0
- [2(5x - 1)]/(5x - 1) + 3/(5x - 1) = 0
(- 10x + 2 + 3)/(5x - 1) = 0
- (10x - 5)/(5x - 1) = 0         un quotient est nul si son numérateur est nul.
10x - 5 = 0
10x = 5
x = 5/10
x = 1/2

S= {1/2}