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x in (-oo:+oo)
Y = (6/13)*x // - (6/13)*x
Y-((6/13)*x) = 0
Y+(-6/13)*x = 0
Y-6/13*x = 0 // - Y
-6/13*x = -Y // : -6/13
x = -Y/(-6/13)
x = 13/6*Y
x = 13/6*Y
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