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)
X-(y/2) = x+y/4 // - x+y/4
X-x-(y/2)-(y/4) = 0
X-x-3/4*y = 0 // - X-3/4*y
-x = -(X-3/4*y) // * -1
x = X-3/4*y
x = X-3/4*y
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