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6*x+3*x-(7/4)-(5/7) = 0
6*x+3*x-7/4-5/7 = 0
9*x-69/28 = 0 // + 69/28
9*x = 69/28 // : 9
x = 69/28/9
x = 23/84
x = 23/84
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