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7-((6/7)*x) = 397/7-5*x // - 397/7-5*x
7-((6/7)*x)-(-5*x)-(397/7) = 0
(-6/7)*x+5*x-397/7+7 = 0
29/7*x-348/7 = 0 // + 348/7
29/7*x = 348/7 // : 29/7
x = 348/7/29/7
x = 12
x = 12
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