(1/2+2/3):5/6-12*(1/2-2/3)
(1/2+2/3):5/6-12*(1/2-2/3) =
1)1/2+2/3 = 1 1/6
2)1 1/6 :5/6 = 1 2/5
3)1/2-2/3 = -1/6
4)12*(-1/6) = -2
5)1 2/5 - (-2) = 3 2/5
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(1/2+2/3):5/6-12*(1/2-2/3) =
1)1/2+2/3 = 1 1/6
2)1 1/6 :5/6 = 1 2/5
3)1/2-2/3 = -1/6
4)12*(-1/6) = -2
5)1 2/5 - (-2) = 3 2/5