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(4/5)*x-(6/5) = 3 // - 3
(4/5)*x-(6/5)-3 = 0
(4/5)*x-6/5-3 = 0
4/5*x-21/5 = 0 // + 21/5
4/5*x = 21/5 // : 4/5
x = 21/5/4/5
x = 21/4
x = 21/4
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