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(5*x)/12 = 20/12 // - 20/12
(5*x)/12-(20/12) = 0
(5*x)/12-5/3 = 0
5/12*x-5/3 = 0 // + 5/3
5/12*x = 5/3 // : 5/12
x = 5/3/5/12
x = 4
x = 4
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