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2014-08-26T20:22:28+03:00
X-2y+13 = 52 ⇒ x-2y = 52-13 ⇒ x-2y = 39
3x-6y+1 = 3(x-2y)+1 = 3·39+1 = 117+1 = 118
1 5 1
2014-08-26T20:32:00+03:00