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Sagot :

a) 3x-2x = 9-4
x = 5

b) 2x-3x = -5-3
-x = -8
x = 8

c) 3x-7x = 5-1
-4x = 4
-4x/4 = 4/4
-x = 1
x = -1

d) 5x = -8
x = -8/5

e) 5x-2x = 4+1
3x = 5
x = 5/3

f) -4x = -5
4x = 5
x = 5/4

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