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(5/2)*x = 15/12 // - 15/12
(5/2)*x-(15/12) = 0
(5/2)*x-5/4 = 0
5/2*x-5/4 = 0 // + 5/4
5/2*x = 5/4 // : 5/2
x = 5/4/5/2
x = 1/2
x = 1/2
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