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(5*x+3)/4 = -12 // + 12
(5*x+3)/4+12 = 0
(5*x+3)/4+(4*12)/4 = 0
5*x+4*12+3 = 0
5*x+51 = 0
(5*x+51)/4 = 0
(5*x+51)/4 = 0 // * 4
5*x+51 = 0
5*x+51 = 0 // - 51
5*x = -51 // : 5
x = -51/5
x = -51/5
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