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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.

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