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9*((x^1)/7) = 18 // - 18
9*((x^1)/7)-18 = 0
9*(x/7)-18 = 0
9/7*x-18 = 0 // + 18
9/7*x = 18 // : 9/7
x = 18/9/7
x = 14
x = 14
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