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x+2y+13=24  determinati 18+2y+x   cina ma ajuta?



Răspuns :

x+2y+13=24(=)x+2y=11(=)x+2y+18=11+18(=)x+2y+18=29
(=) = echivalent
x+2y+13=24       x+2y= 11
18+2y+x= 18+11=29