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Răspuns :

dai factor comun:
c(a+b)=128, sau (a+b)x(-32)=128, a+b=128:(-32)=-4
c(a+b)=-96, (-3)(a+b)=-96, rezulta a+b=96:3=32
c(a+b)=-882, (-9)(a+b)=-882, a+b=882:9=98