If it's not what You are looking for type in the equation solver your own equation and let us solve it.
u in (-oo:+oo)
u-(1/2) = 1/3 // - 1/3
u-(1/2)-(1/3) = 0
u-1/2-1/3 = 0
u-5/6 = 0 // + 5/6
u = 5/6
u = 5/6
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