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