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2014-04-03T10:48:03+03:00
2x+3y=4     /-2
4x+11y=15

-4x-6y=-12
4x+11y=15
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5y=3
y=3/5

2x+9/5=4
10x+9=20
10x=11
x=11/10
1 1 1