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