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(5/3)^2*x = 27/125 // - 27/125
(5/3)^2*x-(27/125) = 0
(5/3)^2*x-27/125 = 0
25/9*x-27/125 = 0 // + 27/125
25/9*x = 27/125 // : 25/9
x = 27/125/25/9
x = 243/3125
x = 243/3125
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