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v in (-oo:+oo)
19.2 = v/3 // - v/3
19.2-(v/3) = 0
19.2-1/3*v = 0 // - 19.2
-1/3*v = -19.2 // : -1/3
v = -19.2/(-1/3)
v = 57.60000058
v = 57.60000058
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