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6*x+8*x-(5/7)+2/3 = 7 // - 7
6*x+8*x-(5/7)+2/3-7 = 0
6*x+8*x-5/7+2/3-7 = 0
14*x-148/21 = 0 // + 148/21
14*x = 148/21 // : 14
x = 148/21/14
x = 74/147
x = 74/147
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