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(4/5)*x-(3/5) = 2/5 // - 2/5
(4/5)*x-(3/5)-(2/5) = 0
(4/5)*x-3/5-2/5 = 0
4/5*x-1 = 0 // + 1
4/5*x = 1 // : 4/5
x = 1/4/5
x = 5/4
x = 5/4
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