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/0.8 = 80 // - 80
x/0.8-80 = 0
1.25*x-80 = 0 // + 80
1.25*x = 80 // : 1.25
x = 80/1.25
x = 64
x = 64
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