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