1/2x(3-2/7)/2/4-1/6+3
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1/2 * ( 3/1 - 2/7) / 2/4 - 1/6 + 3/1
1/2 * ( 21 - 6)/21 / 2/4 - 1/6 + 3/1 =
1/2 * 15/21 / 2/4 - 1/6 + 3/1 =
15/42 : 2/4 - 1/6 + 3/1 =
15/42 * 4/2 - 1/6 + 3/1 =
60/84 - 1/6 + 3/1 =
mmc = 84
( 60 - 14 + 252)/84 = 298/84 = 149/42 =
1/2 * ( 21 - 6)/21 / 2/4 - 1/6 + 3/1 =
1/2 * 15/21 / 2/4 - 1/6 + 3/1 =
15/42 : 2/4 - 1/6 + 3/1 =
15/42 * 4/2 - 1/6 + 3/1 =
60/84 - 1/6 + 3/1 =
mmc = 84
( 60 - 14 + 252)/84 = 298/84 = 149/42 =
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