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(5*x-1)/4 = 12 // - 12
(5*x-1)/4-12 = 0
(5*x-1)/4+(-12*4)/4 = 0
5*x-12*4-1 = 0
5*x-49 = 0
(5*x-49)/4 = 0
(5*x-49)/4 = 0 // * 4
5*x-49 = 0
5*x-49 = 0 // + 49
5*x = 49 // : 5
x = 49/5
x = 49/5
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