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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

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