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-3x = 18 ; x : (-2) = 4 ; 3x = -12 ; 7x - 8 = -22

Răspuns :

-3x=18
x=18:(-3)
x=-6

x:(-2)=4
x=4x(-2)
x=-8

3x=-12
x=-12:3
x=-4

7x-8=-22
7x=-22+8
7x=-14
x=-14:7
x=-2