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(4/5)*x^1 = 4/5 // - 4/5
(4/5)*x^1-(4/5) = 0
(4/5)*x-4/5 = 0
4/5*x-4/5 = 0 // + 4/5
4/5*x = 4/5 // : 4/5
x = 4/5/4/5
x = 1
x = 1
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