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7/12 = (x-1)/18 // - (x-1)/18
7/12-((x-1)/18) = 0
(-1*(x-1))/18+7/12 = 0
(-1*12*(x-1))/(12*18)+(7*18)/(12*18) = 0
7*18-1*12*(x-1) = 0
138-12*x = 0
(138-12*x)/(12*18) = 0
(138-12*x)/(12*18) = 0 // * 12*18
138-12*x = 0
138-12*x = 0 // - 138
-12*x = -138 // : -12
x = -138/(-12)
x = 23/2
x = 23/2
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