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Stiind ca 2x + 2y + 45 = 59 determinati 4y + 4x + 32.

Răspuns :

4y + 4x + 32=2(2y+2x)+32=2·(59-45)+32=2·14+32=28+32=60


2x+2y+45=59

2x+2y=59-45=14

(2x+2y)*2=4x+4y=14*2=28

28+32=60