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x in (-oo:+oo)
Y = (9/5)*x // - (9/5)*x
Y-((9/5)*x) = 0
Y+(-9/5)*x = 0
Y-9/5*x = 0 // - Y
-9/5*x = -Y // : -9/5
x = -Y/(-9/5)
x = 5/9*Y
x = 5/9*Y
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