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/3 // - x/3
y-(x/3) = 0
y-1/3*x = 0 // - y
-1/3*x = -y // : -1/3
x = -y/(-1/3)
x = 3*y
x = 3*y
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