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(3*x)/10 = 9/4 // - 9/4
(3*x)/10-(9/4) = 0
(3*x)/10-9/4 = 0
3/10*x-9/4 = 0 // + 9/4
3/10*x = 9/4 // : 3/10
x = 9/4/3/10
x = 15/2
x = 15/2
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