Verified Answer :

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a+2c-5b-c+a-b=2a+c-6b
~~~~~~~~~~~
a+a=2a
2c-c=c
-5b-b=-6b

ayah1

a + 2c − 5b − c + a − b

1a + 1a + 2c − 1c − 5b − 1b

(1+1) a + (2-1)c + (−5−1)b

     2a     + 1c     − 6b

Answer: 2a + c − 6b

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