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3*x+x-(3/4)+12/7 = 9 // - 9
3*x+x-(3/4)+12/7-9 = 0
3*x+x-3/4+12/7-9 = 0
4*x-225/28 = 0 // + 225/28
4*x = 225/28 // : 4
x = 225/28/4
x = 225/112
x = 225/112
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