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x in (-oo:+oo)
(x+1)/3+(2*x-1)/4 = (10*x+1)/12 // - (10*x+1)/12
(x+1)/3+(2*x-1)/4-((10*x+1)/12) = 0
(x+1)/3+(2*x-1)/4+(-1*(10*x+1))/12 = 0
(4*12*(x+1))/(3*4*12)+(3*12*(2*x-1))/(3*4*12)+(-1*3*4*(10*x+1))/(3*4*12) = 0
4*12*(x+1)+3*12*(2*x-1)-1*3*4*(10*x+1) = 0
120*x-120*x-12+12 = 0
0 = 0
0/(3*4*12) = 0
0/(3*4*12) = 0 // * 3*4*12
0 = 0
x belongs to the empty set
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