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2[15+3(x-1)] =4(x+7)

Răspuns :

30+6x+6=4x+28
36-28=4x-6x
8=-2x
x=-4
2(15+3(x-1))=4(x+7)
30+6(x-1)=4x+28
30 +6x-6=4x+28
6x-4x=28-30
2x=-2
x=-2/2
x=-1