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x in (-oo:+oo)
Y = (2*x)/6 // - (2*x)/6
Y-((2*x)/6) = 0
Y+(-1/3)*x = 0
Y-1/3*x = 0 // - Y
-1/3*x = -Y // : -1/3
x = -Y/(-1/3)
x = 3*Y
x = 3*Y
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