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4x+7y=3
2x-3y =1
2x-3y =1 /*(-2)
-4x+6y =-2
_________________
13y=1
y= 1/13
2x-3*(1/13)=1
2x- 3/13 =1
2x=1+ 3/13
2x=1 i 3/13
2x=16/13 /*(1/2)
x= 16/26
x=8/13
y=1/13
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4x+7y=3
2x-3y =1 /*(-2)
4x+7y=3
-4x+6y =-2
_________________
13y=1
y= 1/13
2x-3*(1/13)=1
2x- 3/13 =1
2x=1+ 3/13
2x=1 i 3/13
2x=16/13 /*(1/2)
x= 16/26
x=8/13
y=1/13