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(9*x)/25 = 9/10 // - 9/10
(9*x)/25-(9/10) = 0
(9*x)/25-9/10 = 0
9/25*x-9/10 = 0 // + 9/10
9/25*x = 9/10 // : 9/25
x = 9/10/9/25
x = 5/2
x = 5/2
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