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5/6 = (x-4)/12 // - (x-4)/12
5/6-((x-4)/12) = 0
(-1*(x-4))/12+5/6 = 0
(-1*6*(x-4))/(6*12)+(5*12)/(6*12) = 0
5*12-1*6*(x-4) = 0
84-6*x = 0
(84-6*x)/(6*12) = 0
(84-6*x)/(6*12) = 0 // * 6*12
84-6*x = 0
84-6*x = 0 // - 84
-6*x = -84 // : -6
x = -84/(-6)
x = 14
x = 14
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