Sagot :
a) 2x+2=5+x
2x-x=5-2
x=3
b) -3+2x=4-5x
2x+5x=4+3
7x=7
x=1
c) 6x+2=x+12
6x-x=12-2
5x=10
x=2
d) 3x+3=-x-1
3x+x=-1-3
4x=-4
x=-1
e) 3x+7=x+2
3x-x=2-7
2x=-5
x=-5/2
f) 2+2y=-1+3y
2y-3y=-1-2
-y=-3
y=3
a) x = 3
c) 6x-x = 12-2
5x = 10
x = 10/5
x= 2
e) 3x-x = 2-7
2x = -5
x= -5/2
x = -2.5
b) 2x+5x = 3+4
7x = 7
x= 7/7
x= 1
d) 3x +x = -3-1
4x = - 4
x= -4/4
x = -1
f) 2y - 3y = -2 -1
-1y = - 3
y = -3/-1
y = 3