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c) strata 50 - 21+(-29)=-50
d) zysk 20 20
e) strata 8 -8
f) strata 2 -17+15=-2
g) strata 35 65+(-100)= -35
h) zysk 5 -2, 5+7, 5=-5
c)-50
d) 20
e)-8
f)-2
g) -35
h) 5
:)