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