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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.

-25 . x - 50 . y=250
-50 . x + 25 . y=-250
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x=
y=
Correctness test
-25 . - 50 . =250
-50 . + 25 . =-250