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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.

-9 . x - 9 . y=27
18 . x - 9 . y=54
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x=
y=
Correctness test
-9 . - 9 . =27
18 . - 9 . =54