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Equations of 2 unknowns

Mix

Instructions:

Solve a set of two equations with two unknowns and find out values of unknown variables x and y.

-18 . x - 36 . y=54
-18 . x + 18 . y=-54
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x=
y=
Correctness test
-18 . - 36 . =54
-18 . + 18 . =-54