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(3*x)/20-(9/4) = 6 // - 6
(3*x)/20-(9/4)-6 = 0
(3*x)/20-9/4-6 = 0
3/20*x-33/4 = 0 // + 33/4
3/20*x = 33/4 // : 3/20
x = 33/4/3/20
x = 55
x = 55
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