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2014-08-20T16:47:47-03:00
{x+3y= 6 *4
{-4x+6y= -12

{4x+12y= 24
{-4x+6y= -12

18y= 12
y= 12/18 ÷6
y= 2/3

x+3(2/3)= 6
x= 6 - 11/3
x=5/3
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