Răspunsuri

2014-10-02T23:34:51+03:00
X+3y+18=54
x+3y=54-18
x+3y=36=>x=36-3y
3y=36-x

6y+89+2x=2* (36-x)+89+2x=72-2x+89+2x=72+89=161
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