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6=50-x/4½-y
x=16y
6(4½-y)=50-x
x=16y
27-6y=50-x
x=16y
-6y+x=23
x=16y
-6y+16y=23
x=16y
10y=23
x=16y
y=2,3
x=36,8 przebiegł 36,8km a przeszedł 13,2km