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