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6*x+9 = 2*x+71/7 // - 2*x+71/7
6*x-(2*x)-(71/7)+9 = 0
6*x-2*x-71/7+9 = 0
4*x-8/7 = 0 // + 8/7
4*x = 8/7 // : 4
x = 8/7/4
x = 2/7
x = 2/7
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