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