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x in (-oo:+oo)
(v^3)/2 = x/18 // - x/18
(v^3)/2-(x/18) = 0
1/2*v^3-1/18*x = 0 // - 1/2*v^3
-1/18*x = -(1/2*v^3) // : -1/18
x = (-(1/2*v^3))/(-1/18)
x = 9*v^3
x = 9*v^3
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