Bonjour,
a=
-4 = x
x = -4
b)
-9-15 = 8x
-24 = 8x
x= -24/8
x= -3
c)
3x-x = 7 +21
2x =28
x =28/2
x= 14
d)
1/2 - 5/2 = x
-4/2 = x
-2 =x
x =-2
a)
2x+3x = 15-5
5x = 10
x = 10/5
x = 2
b)
4+1 = -x +6x
5 = 5x
x = 5/5
x = 1
c)
7m -m = -8 -10
6m = -16
m= -16/6
m = -8/3
d)
-12y +13y = 4
y = 4