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x in (-oo:+oo)
y = (-3/5)*x // - (-3/5)*x
y-((-3/5)*x) = 0
(3/5)*x+y = 0
3/5*x+y = 0 // - y
3/5*x = -y // : 3/5
x = -y/3/5
x = -5/3*y
x = -5/3*y
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