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Equations of 2 unknowns

Instructions:

Solve a set of two equations with two unknowns and find out values of unknown variables x and y.

2 . x - 2 . y=-4
-4 . x - 2 . y=2
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x=
y=
Correctness test
2 . - 2 . =-4
-4 . - 2 . =2