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)
X = (1/3)*x // - (1/3)*x
X-((1/3)*x) = 0
X+(-1/3)*x = 0
X-1/3*x = 0 // - X
-1/3*x = -X // : -1/3
x = -X/(-1/3)
x = 3*X
x = 3*X
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