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Suma “y” en ambos lados
5x-y+y=3+y
Simplifica
5x=3+y
Divide ambos entre 5
5x/5=3/5+y/5
Simplifica
X=3+y/5
-2x+4y=-12
Resta 4y en ambos lados
-2x+4y-4y=-12-4y
Simplifica
-2x=-12-4y
Divide ambos entre -2 y simplifica
R//x=2