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(4/5)*x-(9/5) = 3 // - 3
(4/5)*x-(9/5)-3 = 0
(4/5)*x-9/5-3 = 0
4/5*x-24/5 = 0 // + 24/5
4/5*x = 24/5 // : 4/5
x = 24/5/4/5
x = 6
x = 6
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