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8+2+4/12
14/12
7/6
3/5+2/10+19/20
12+4+19/20
23+12/20
35/20
7/4
4*2/6*2 + 2/12 + 1*4/3*4
8/12+2/12+4/12=(8+2+4)/12=14/12=7/6
ponemos a un mismo denominador:
3*4/5*4+2*2/10*2+19/20
12/20+4/20+19/20=(12+4+19)/20=35/20=7/4