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2014-06-08T20:58:49+03:00
16x+8y-10x-5y=40
14x-7y+6x-12y=42

6x+3y=40   x=(40-3y)/6
20x-19y=42

20.(40-3y)/6-19y=42
400-30y-57y=126
-87y=-274
y=274/87
x=(40-3.274/87)/6=443/58

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