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Daca a-5b=7 aflati × din: ×+3a-15b=29

Răspuns :

x+3a-15b=29
x+3(a-5b)=29
x+3*7=29
x=29-21=8
a-5b=7 /*3  inmultim relatia cu 3 => 3a-15b=21

x+3a-15b=29
x+21=29
x=29-21
x=8