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x in (-oo:+oo)
(1/3)*x-((1/4)*x) = x-12 // - x-12
(1/3)*x-((1/4)*x)-x+12 = 0
(1/3)*x+(-1/4)*x-x+12 = 0
12-11/12*x = 0 // - 12
-11/12*x = -12 // : -11/12
x = -12/(-11/12)
x = 144/11
x = 144/11
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