Bonsoir :)

2x + 1 = 8x - 2

2x - 8x = -2 - 1

-6x = -3

8 - 2x = 4x + 2

8 - 2 = 4x + 2x

6 = 6x

2(4x + 1) = 3(x + 0)

8x + 2 = 3x + 0

8x - 3x = 0 - 2

5x = -2

5(2x - 1) = 10x - 1

10x - 5 = 10x - 1

10x - 10x = -1 + 5

0x = 4 => IMPOSSIBLE car {0x}