Answer:
D
Explanation:
The answer is D because you want to add the same variables together (6x+7x) to simplify. and you would leave the 5 alone because it does not have the same variable.
D 13x+5
the answer is D because all of the other ones are completely different expressions. but D is the expression that's in the problem, except they combine 6x and 7x because they're like terms
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