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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.

-1 . x + 2 . y=-1
-1 . x - 1 . y=2
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=
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x=
y=
Correctness test
-1 . + 2 . =-1
-1 . - 1 . =2