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x in (-oo:+oo)
2/3-(1/4) = x/12 // - x/12
2/3-(x/12)-(1/4) = 0
2/3-(x/12)-1/4 = 0
5/12-1/12*x = 0 // - 5/12
-1/12*x = -5/12 // : -1/12
x = -5/12/(-1/12)
x = 5
x = 5
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