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)
(1/2)*v^2 = x // - x
(1/2)*v^2-x = 0
1/2*v^2-x = 0 // - 1/2*v^2
-x = -(1/2*v^2) // * -1
x = 1/2*v^2
x = 1/2*v^2
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