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x in (-oo:+oo)
(x+1)/3-((x+2)/4) = (x+3)/6 // - (x+3)/6
(x+1)/3-((x+2)/4)-((x+3)/6) = 0
(x+1)/3+(-1*(x+2))/4+(-1*(x+3))/6 = 0
(4*6*(x+1))/(3*4*6)+(-1*3*6*(x+2))/(3*4*6)+(-1*3*4*(x+3))/(3*4*6) = 0
4*6*(x+1)-1*3*6*(x+2)-1*3*4*(x+3) = 0
6*x-12*x-36-12 = 0
-6*x-48 = 0
(-6*x-48)/(3*4*6) = 0
(-6*x-48)/(3*4*6) = 0 // * 3*4*6
-6*x-48 = 0
-6*x-48 = 0 // + 48
-6*x = 48 // : -6
x = 48/(-6)
x = -8
x = -8
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