Sagot :
Bonjour,
a)
3x= 7-5
2x= 2
x= 2/2 = 1
b)
-3-1 = 2x
-4 = 2x
x= -4/2 = -2
c)
1-5= 7x -3x
-4 = 4x
x= -4/4 = -1
d)
3+5 = 3x-2x
x = 8
2x+5=7
2x=2
X=1
-2x-3=1
-2x=4
X=-2
3x+1=7x+5
1=4x+5
-4=4x
X=-1
2x+3=3x-5
2x=3x-8
-x=-8
X=8
2x=2
X=1
-2x-3=1
-2x=4
X=-2
3x+1=7x+5
1=4x+5
-4=4x
X=-1
2x+3=3x-5
2x=3x-8
-x=-8
X=8