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(5/8)*(x-3) = 5/12 // - 5/12
(5/8)*(x-3)-(5/12) = 0
(5/8)*(x-3)-5/12 = 0
5/8*(x-3)-5/12 = 0
(5/8*12*(x-3))/12-5/12 = 0
5/8*12*(x-3)-5 = 0
15/2*x-55/2 = 0
(15/2*x-55/2)/12 = 0
(15/2*x-55/2)/12 = 0 // * 12
15/2*x-55/2 = 0
15/2*x-55/2 = 0 // + 55/2
15/2*x = 55/2 // : 15/2
x = 55/2/15/2
x = 11/3
x = 11/3
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