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200-(64+a×12+4×11)=2×(50-24×2+13×5-9×5)

Răspuns :

Heart4youto
200-(64+a×12+44)=2×(50-48+65-45)
200-(64+a×12+44)=2×(2+20)
200-(64+a×12+44)=2×22
200-(64+a×12+44)=44
64+a×12+44=200-44
64+a×12+44=156
64+a×12=156-44
64+a×12=112
a×12=112-64
a×12=48
a=48:12
a=4