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