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9*(x+1/7) = 18 // - 18
9*(x+1/7)-18 = 0
9*(x+1/7)-18 = 0
9*x-117/7 = 0
9*x-117/7 = 0
9*x-117/7 = 0 // + 117/7
9*x = 117/7 // : 9
x = 117/7/9
x = 13/7
x = 13/7
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