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x in (-oo:+oo)
y = 1*(5/4)*x // - 1*(5/4)*x
y-(1*(5/4)*x) = 0
(-5/4)*x+y = 0
y-5/4*x = 0 // - y
-5/4*x = -y // : -5/4
x = -y/(-5/4)
x = 4/5*y
x = 4/5*y
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