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(3*x)/4 = 9/20 // - 9/20
(3*x)/4-(9/20) = 0
(3*x)/4-9/20 = 0
3/4*x-9/20 = 0 // + 9/20
3/4*x = 9/20 // : 3/4
x = 9/20/3/4
x = 3/5
x = 3/5
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