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(3*x)/8+3/4 = 9 // - 9
(3*x)/8+3/4-9 = 0
3/8*x-33/4 = 0 // + 33/4
3/8*x = 33/4 // : 3/8
x = 33/4/3/8
x = 22
x = 22
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