Question

sum is a-2b-6c and 5a-2c+9b​

Answer 1

Answer:

6a-11b-4c

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Answer 2

$\large\fbox\red{Answer}$

$\sf⇒\:Sum\:of\:(a-2b-6c)\:and\:(5a-2c+9b)$

$\sf⇒\:a-2b-6c\:+(5a-2c+9b)$

$\sf⇒\:a-2b-6c\:+5a-2c+9b$

$\sf⇒\:a+5a-2b+9b-6c-2c\:$

$\sf⇒\:6a+7b-8c\:$

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