a) -3x+5=x-3 b)7x-5=-3(5x-4) c)-4(5x-6)+9=-10x-18 d)7x+4(-2x+3)=-5x-3 e)-2(-3x-1)+8x-6=7x-(5-x) f)3 sur4x+2 sur 3=2x+7 sur6

a) -3x+5=x-3
-3x-x = -3-5
-4x =-8
x = -8/-4
x = 2

b)7x-5=-3(5x-4)
7x-5 = -15x+12
7x+15x = 12+5
22x = 17
x = 17/22

c)-4(5x-6)+9=-10x-18
-20x+24 = -10x-18
-20x+10x = -24-18
-10x = -42
x = -42/-10
x = 42/10

d)7x+4(-2x+3)=-5x-3
7x-8x+12 =  -5x-3
-x+12 = -5x-3
-x+5x = -12-3
4x = -15
x = -15/4
e)-2(-3x-1)+8x-6=7x-(5-x)
6x+2+8x-6 = 7x-5+x
14x-4 = 8x-5
14x-8x = -5+4
6x = -1
x = -1/6
f)3 sur4x+2 sur 3=2x+7 sur6
3/4x + 2/3 = 2x + 7/6
3*3/3*4x +  2*4x/3*4x = 12x/6 +7/6
(9+8x)/12x = (12x+7)/6
(9+8x)/2x = 12x+7
9+8x = 2x(12x+7)
9+12x = 24x²+14x
24x²+14x-12x-9 = 0
24x²+2x-9 = 0