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3*[3*(3x+7)+10]+11=374

vreau un raspuns concret si explicat



Răspuns :

⇒3·(9x+21+10)=374-11
3·(9x+31)=363
9x+31=363:3
9x+31=121
9x=121-31
9x=90
x=90:9
x=10