If it's not what You are looking for type in the equation solver your own equation and let us solve it.
v in (-oo:+oo)
4 = v/6.4 // - v/6.4
4-(v/6.4) = 0
4-0.15625*v = 0
4-0.15625*v = 0 // - 4
-0.15625*v = -4 // : -0.15625
v = -4/(-0.15625)
v = 25.6
v = 25.6
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