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