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x in (-oo:+oo)
Y = (-8/20)*x // - (-8/20)*x
Y-((-8/20)*x) = 0
Y+(2/5)*x = 0
Y+2/5*x = 0 // - Y
2/5*x = -Y // : 2/5
x = -Y/2/5
x = -5/2*Y
x = -5/2*Y
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