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2014-10-18T17:25:56+03:00
X=9-2=>x=7 (1)
3*7+5y=23=> 21+5y=23=> 5y=23-21=> 5y=2=> y=2/5 (2)
(1) si (2) => 4*7+7*(2/5)= 28+(7*5+2)/5= 28+37/5= (28*5+37)
= 140+37= 177