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8/10 = (x-6)/9 // - (x-6)/9
8/10-((x-6)/9) = 0
(-1*(x-6))/9+4/5 = 0
(-1*5*(x-6))/(5*9)+(4*9)/(5*9) = 0
4*9-1*5*(x-6) = 0
66-5*x = 0
(66-5*x)/(5*9) = 0
(66-5*x)/(5*9) = 0 // * 5*9
66-5*x = 0
66-5*x = 0 // - 66
-5*x = -66 // : -5
x = -66/(-5)
x = 66/5
x = 66/5
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