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36*(1-(3*x)) = 1/216 // - 1/216
36*(1-(3*x))-(1/216) = 0
36*(1-3*x)-1/216 = 0
(36*216*(1-3*x))/216-1/216 = 0
36*216*(1-3*x)-1 = 0
7775-23328*x = 0
(7775-23328*x)/216 = 0
(7775-23328*x)/216 = 0 // * 216
7775-23328*x = 0
7775-23328*x = 0 // - 7775
-23328*x = -7775 // : -23328
x = -7775/(-23328)
x = 7775/23328
x = 7775/23328
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