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v in (-oo:+oo)
9/2 = v/4 // - v/4
9/2-(v/4) = 0
9/2-1/4*v = 0 // - 9/2
-1/4*v = -9/2 // : -1/4
v = -9/2/(-1/4)
v = 18
v = 18
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