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5+x-2y
5-2y+x
b)-a + 3b + 8 - 7c
3b-a+8-7c
3b+807c-a
c)5k - 2l - 3m + 9
5k-3m-2l+9
9-3m-2l+5k
Oblicz :
-2/5c - c + 3/5c =-7/5c+3/5c=-4/5c