(591+1125:75)=606
606*56=33936
46*702=32292
33936-32292=1644
1,3/ 35 / 1,20/56 -3,5/21 / 1,22/63
1,3/35=13/10 /35= 13/350
1,2/56 =12/10 /56=3/140
13/350 /3/140 = 26/15
3,5/21= 35/10 /21 = 1/6
1,22/63 = 122/100 /63 = 122/6300
1/6 / 122/6300 =525/61
26/15 - 525/61 =1586/915 - 7875/915 = -6289 /915 = 6 799/915