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x in (-oo:+oo)
y = (4/3)*x // - (4/3)*x
y-((4/3)*x) = 0
(-4/3)*x+y = 0
y-4/3*x = 0 // - y
-4/3*x = -y // : -4/3
x = -y/(-4/3)
x = 3/4*y
x = 3/4*y
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