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daca a-5b=7 atunci aflati x din relatiile;
a)x+3a-15b=29;
b)x-2a+10b+17=4;
c)47-x+7a-35b=2a-10b+4.


Răspuns :

A) x+3 (a-5b)=29 <=> x+21=29 <=> x=8 B)x-2 (a-5b)+17=4 <=> x-14+17=4 <=> x=1 C) 47-x+7 (a-5b)=2 (a-5b)+4 <=> 47-x+49=14+4 <=> x=78