y=-2x/5

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Solution for y=-2x/5 equation: 


x in (-oo:+oo)

y = (-2*x)/5 // - (-2*x)/5

y-((-2*x)/5) = 0

(2/5)*x+y = 0

2/5*x+y = 0 // - y

2/5*x = -y // : 2/5

x = -y/2/5

x = -5/2*y

x = -5/2*y

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