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-(1/5) = 4/5 // - 4/5
x-(1/5)-(4/5) = 0
x-1/5-4/5 = 0
x-1 = 0 // + 1
x = 1
x = 1
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