Svp urgent!pouvez vous m aidez sur ces équations? X+3=17 -15=-20x 13-a=-50 Xsur4=-23 3(x-2)=5x-(+3) 4x=3x+2+2x-5 Mrc

bonsoir

x +3 = 17
x = 17 - 3
x = 14

- 15 = - 20 x
x = 15/20 = 5 /4

13 - a = - 50
- a = - 50 - 13
- a = - 63
a = 63 

x/4 = - 23
x / 4 = - 92/4
x = - 92

3 ( x - 2) =  5 x - 3
3 x - 6 = 5 x - 3
3 x - 5 x = - 3 + 6
- 2 x = 3
x = - 3/2

4 x  = 3 x + 2 + 2 x - 5
4 x - 3 x - 2 x = 2 - 5
- x = - 3
x = 3