y=-x/2

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Solution for y=-x/2 equation: 


x in (-oo:+oo)

y = -x/2 // + -x/2

y-(-x/2) = 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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