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x in (-oo:+oo)
Y = (-9/4)*x // - (-9/4)*x
Y-((-9/4)*x) = 0
Y+(9/4)*x = 0
Y+9/4*x = 0 // - Y
9/4*x = -Y // : 9/4
x = -Y/9/4
x = -4/9*Y
x = -4/9*Y
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