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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