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