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x in (-oo:+oo)
2/3-(x/4) = 1/12 // - 1/12
2/3-(x/4)-(1/12) = 0
2/3-(x/4)-1/12 = 0
7/12-1/4*x = 0 // - 7/12
-1/4*x = -7/12 // : -1/4
x = -7/12/(-1/4)
x = 7/3
x = 7/3
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