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(4/5)*x-(2/5) = 9/5 // - 9/5
(4/5)*x-(2/5)-(9/5) = 0
(4/5)*x-2/5-9/5 = 0
4/5*x-11/5 = 0 // + 11/5
4/5*x = 11/5 // : 4/5
x = 11/5/4/5
x = 11/4
x = 11/4
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