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x in (-oo:+oo)
Y = (7/2)*x // - (7/2)*x
Y-((7/2)*x) = 0
Y+(-7/2)*x = 0
Y-7/2*x = 0 // - Y
-7/2*x = -Y // : -7/2
x = -Y/(-7/2)
x = 2/7*Y
x = 2/7*Y
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