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(3/5)*x-3 = 9/4 // - 9/4
(3/5)*x-(9/4)-3 = 0
(3/5)*x-9/4-3 = 0
3/5*x-21/4 = 0 // + 21/4
3/5*x = 21/4 // : 3/5
x = 21/4/3/5
x = 35/4
x = 35/4
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