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(5/2)*x = 25/4 // - 25/4
(5/2)*x-(25/4) = 0
(5/2)*x-25/4 = 0
5/2*x-25/4 = 0 // + 25/4
5/2*x = 25/4 // : 5/2
x = 25/4/5/2
x = 5/2
x = 5/2
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