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x in (-oo:+oo)
Y = (1/5)*x // - (1/5)*x
Y-((1/5)*x) = 0
Y+(-1/5)*x = 0
Y-1/5*x = 0 // - Y
-1/5*x = -Y // : -1/5
x = -Y/(-1/5)
x = 5*Y
x = 5*Y
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