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(5/6)^4*x = 2/3-(5*x) // - 2/3-(5*x)
(5/6)^4*x+5*x-(2/3) = 0
(5/6)^4*x+5*x-2/3 = 0
7105/1296*x-2/3 = 0 // + 2/3
7105/1296*x = 2/3 // : 7105/1296
x = 2/3/7105/1296
x = 864/7105
x = 864/7105
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