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324×7-40:5+(a×7-12)=8724

Răspuns :

324*7-40:5+(a*7-12)=8724
2268-8+(a*7-12)=8724
2260+a*7=8724+12
2260+a*7=8736
2260+a=8736:7
2260+a=1248
a=2260-1248
a=1012

*-inmultire
Sper ca te-am ajutat ^^