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1 -- ----- : ----- + ----- (-- ------ ) -- -----
5 15 8 9 12
4*15 3 (2) 11
1 -- --------- -- --------- -- -----
5 * 2 8 (9) 12
60 6 11
1 -- ----- -- ----- -- -----
10 72 12
simplificamos
1 11
1 -- 6 -- ----- -- -----
12 12
1 - 6 - 1 = - 6