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