exercice 3
a) 7x = 13 x=13/7
b) x-3=12
x=12+3=15
c) 3x+10=28
3x=28-10
3x=18
x=18/3
x=6
exercice 4
a)4x+7=2x+13
4x-2x=13-7
2x=6
x=6/2
x=3
b) -3x-8 = -7x-4
-3x+7x=-4+8
4x=4
x=4/4
x=1
3) a) 7x = 13
x= 13/7
b) x-3 = 12
x = 12-3
x= 9
c) -x/3 = 5
-x = 5x3
-x = 15
x = -15
d) 3x + 10 = 28
3x = 28-10
3x = 18
x = 18/3
x = 6
4) a) 4x + 7 = 2x + 13
4x = 2x + 13 - 7
4x = 2x + 6
4x - 2x = 6
2x = 6
x = 6/2
x = 3
b) -3x - 8 = -7x - 4
-3x = -7x - 4 + 8
-3x = -7x + 4
-3x + 7x = 4
4x = 4
x = 4/4
x = 1
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exercice 3
a) 7x = 13 x=13/7
b) x-3=12
x=12+3=15
c) 3x+10=28
3x=28-10
3x=18
x=18/3
x=6
exercice 4
a)4x+7=2x+13
4x-2x=13-7
2x=6
x=6/2
x=3
b) -3x-8 = -7x-4
-3x+7x=-4+8
4x=4
x=4/4
x=1
3) a) 7x = 13
x= 13/7
b) x-3 = 12
x = 12-3
x= 9
c) -x/3 = 5
-x = 5x3
-x = 15
x = -15
d) 3x + 10 = 28
3x = 28-10
3x = 18
x = 18/3
x = 6
4) a) 4x + 7 = 2x + 13
4x = 2x + 13 - 7
4x = 2x + 6
4x - 2x = 6
2x = 6
x = 6/2
x = 3
b) -3x - 8 = -7x - 4
-3x = -7x - 4 + 8
-3x = -7x + 4
-3x + 7x = 4
4x = 4
x = 4/4
x = 1