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x in (-oo:+oo)
y = (-2/3)*x // - (-2/3)*x
y-((-2/3)*x) = 0
(2/3)*x+y = 0
2/3*x+y = 0 // - y
2/3*x = -y // : 2/3
x = -y/2/3
x = -3/2*y
x = -3/2*y
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