If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
(v/4)*x = y/y // - y/y
(v/4)*x-(y/y) = 0
(v/4)*x-1 = 0
1/4*v*x-1 = 0 // + 1
1/4*v*x = 1 // : 1/4*v
x = 1/(1/4*v)
x = 4*v^-1
x = 4*v^-1
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