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(4/5)*x-0.2 = 1 // - 1
(4/5)*x-1-0.2 = 0
4/5*x-1.2 = 0 // + 1.2
4/5*x = 1.2 // : 4/5
x = 1.2/4/5
x = 1.5
x = 1.5
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