Răspuns:
13.
a)7x-7=6-3(x+1)
7x-7=6-3x-3
7x-7=3-3x
7x+3x=3+7=10x=10; x=1
S={1}
b)3x-4=x+2(x-2)
3x-4=x+2x-4
3x-4=3x-4
3x-3x=4-4
0=0''A''=>orice nr. intreg e solutie
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