SOLUTION: Simplify by removing all grouping symbols and combining like terms. (10a + 9b + 9c) – (a – b – 2c)

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Question 1035974: Simplify by removing all grouping symbols and combining like terms.
(10a + 9b + 9c) – (a – b – 2c)
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The grouping keeps one part of the expression separate from the other part of the expression. Work inside groupings first.

(10a + 9b + 9c) – (a – b – 2c)------------nothing to calculate there yet;

10a+9b+9c-a-(-b)-(-2c)

This step is only to see why:
10a+9b+9c-a+b+2c

This is two steps in one, but should be understandable:
10a-a+9b+b+9c+2c

then
ANSWER: 9a+10b+12c