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)*y = 2*x // - 2*x
(1/2)*y-(2*x) = 0
(1/2)*y-2*x = 0
1/2*y-2*x = 0 // - 1/2*y
-2*x = -(1/2*y) // : -2
x = (-(1/2*y))/(-2)
x = 1/4*y
x = 1/4*y
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