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(3*x-1)/6-((x+3)/4) = 7/12 // - 7/12
(3*x-1)/6-((x+3)/4)-(7/12) = 0
(3*x-1)/6-((x+3)/4)-7/12 = 0
(3*x-1)/6+(-1*(x+3))/4-7/12 = 0
(4*12*(3*x-1))/(4*6*12)+(-1*6*12*(x+3))/(4*6*12)+(-7*4*6)/(4*6*12) = 0
4*12*(3*x-1)-1*6*12*(x+3)-7*4*6 = 0
72*x-264-168 = 0
72*x-432 = 0
(72*x-432)/(4*6*12) = 0
(72*x-432)/(4*6*12) = 0 // * 4*6*12
72*x-432 = 0
72*x-432 = 0 // + 432
72*x = 432 // : 72
x = 432/72
x = 6
x = 6
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