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a=18,8 spr.18,8+17,2=36
21/2-b=11/3
21,2-11/3=b
b=63/6-22/6
b=41/6 spr 21/2-41,6=63/6-41/6=22/6=11/3
c-4,2=61/2
c=61/2+42/10
c=305/10+42/10=347/10 spr.347/10-42/10=305/10=61/2
31/3xd=22/9
d=22/9x3/31
d=22/93 spr.31/3x22/92=22/9