Bonjour,
x - 2 = 5
x = 5 + 2
x = 7
2x = -5
x = -5/2
-x + 3 = 0
-x = 0 - 3
-x = -3
x = 3
x/3 = 0
x = 0 * 3 = 0
-2x + 3 = 5
-2x = 5 - 3
-2x = 2
x = -2/2
x = -1
