-y=1/2x

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Solution for -y=1/2x equation: 


x in (-oo:+oo)

-y = (1/2)*x // - (1/2)*x

-((1/2)*x)-y = 0

(-1/2)*x-y = 0

-1/2*x-y = 0 // + y

-1/2*x = y // : -1/2

x = y/(-1/2)

x = -2*y

x = -2*y

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