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