y=-4/5x

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Solution for y=-4/5x equation: 


x in (-oo:+oo)

y = (-4/5)*x // - (-4/5)*x

y-((-4/5)*x) = 0

(4/5)*x+y = 0

4/5*x+y = 0 // - y

4/5*x = -y // : 4/5

x = -y/4/5

x = -5/4*y

x = -5/4*y

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