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x in (-oo:+oo)
x/12-((x-3)/3) = 12 // - 12
x/12-((x-3)/3)-12 = 0
(-1*(x-3))/3+x/12-12 = 0
(-1*12*(x-3))/(3*12)+(3*x)/(3*12)+(-12*3*12)/(3*12) = 0
3*x-1*12*(x-3)-12*3*12 = 0
36-9*x-432 = 0
-9*x-396 = 0
(-9*x-396)/(3*12) = 0
(-9*x-396)/(3*12) = 0 // * 3*12
-9*x-396 = 0
-9*x-396 = 0 // + 396
-9*x = 396 // : -9
x = 396/(-9)
x = -44
x = -44
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