Answers:
Addition is commutative. That means that when you are adding and subtracting things, you can move them around into any order you want. 1+2 is the same as 2+1 regardless of whether the 2 comes first or the 1 comes first.
With your problem you want to start by rearranging the terms so that like terms are together.
6x+6+5x-8
6x+5x+6-8
Then add and/or subtract your like terms. In this case the 6x+5x can be simplified to 11x and the 6-8 can be simplified to -2.
6x+5x+6-8
(6x+5x)+(6-8)
(11x)+(-2)
11x-2
I realize everyone else gave you the right answer, but it might help you to understand why it's the right answer.
11x-2
11x - 2
11x+-2
11x-2
Put togather the similar parts
6x and 5x go togather to equall 11x
and 6 and -8 go togather to equall -2
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