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5+x-2y=
b)3b-7c-a+8=
-7c+8-a+3b=
c)9-2l-3m+5k=
-3m+9-2l+5k=
b) -a + 3b + 8 - 7c = 3b - a - 7c + 8 = -a - 7c + 8+ 3b
c) 5k - 2l - 3m + 9 = 5k - 3m +9 - 2l = 9 - 2l - 3m + 5k
liczę na naj ;):)