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(4*x+13)/12 = 5/4 // - 5/4
(4*x+13)/12-(5/4) = 0
(4*x+13)/12-5/4 = 0
(4*(4*x+13))/(4*12)+(-5*12)/(4*12) = 0
4*(4*x+13)-5*12 = 0
16*x-8 = 0
(16*x-8)/(4*12) = 0
(16*x-8)/(4*12) = 0 // * 4*12
16*x-8 = 0
16*x-8 = 0 // + 8
16*x = 8 // : 16
x = 8/16
x = 1/2
x = 1/2
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