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b)-a+3b+8-7c= 3b + 8 - 7c - a = - a -7c + 3b +8
c)5k-2l-3m+9 = -2l - 3m + 9 +5k = 5k -3m - 2l +9
-2y+5+x
5+x-2y
b)-a+3b+8-7c=
3b+8-7c-a
8-7c-a+3b
c)5k-2l-3m+9=
-2l-3m+9+5k
-3m+9+5k-2l