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