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
4/3*x = 0 // : 4/3
x = 0
x = 0
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