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2014-08-01T09:48:50+03:00
X-2y=52-13

x-2y=39

3x-6y+1= 3(x-2y)+1= 3*39+1= 117+1=118
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2014-08-01T09:51:18+03:00
x-2y+13=52 
x-2y=52-13
x-2y=39          |*3
⇒3x-6y=117

3x-6y+1
=117+1
3x-6y+1=118

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