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b)-a + 3b + 8 - 7c =-7c+3b+8-a
c)5k - 2l - 3m + 9 =5k+9-3l
nie wiem czy o to chodzilo??
B) -a+8+3b-7 i -7c-a+8+3b
C) 5k-3m+9-2l i -3m+9+5k-2l