7/12-1/2= 1/12
1/12*3/20=3/240=1/80
1/80+79/80=80/80=1
7/12+1/2=13/12
13/24:13/12=13/24*12/13=1/2
1/2-1/4=1/4
1:1/4=1*4=4
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7/12-1/2= 1/12
1/12*3/20=3/240=1/80
1/80+79/80=80/80=1
7/12+1/2=13/12
13/24:13/12=13/24*12/13=1/2
1/2-1/4=1/4
1:1/4=1*4=4