-13x-27y=126
(x, -x)
y=-x
-13x-27(-x) =126
-13x-(-27x)=156
-13x+27x=156
14x=126
x=9
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-13x-27y=126
(x, -x)
y=-x
-13x-27(-x) =126
-13x-(-27x)=156
-13x+27x=156
14x=126
x=9