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-(1/5) = -5/6 // + -5/6
u-(1/5)-(-5/6) = 0
u-1/5+5/6 = 0
u+19/30 = 0 // - 19/30
u = -19/30
u = -19/30
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