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x in (-oo:+oo)
(1/3)*x-((3/4)*x) = 1/12 // - 1/12
(1/3)*x-((3/4)*x)-(1/12) = 0
(1/3)*x+(-3/4)*x-1/12 = 0
-5/12*x-1/12 = 0 // + 1/12
-5/12*x = 1/12 // : -5/12
x = 1/12/(-5/12)
x = -1/5
x = -1/5
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