Final answer:
The expression 3x + 2 - 3r + 7 + 5x simplifies to 8x + 9 - 3r. The coefficient of the x term in the simplified expression is 8, which is not one of the provided options.
Step-by-step explanation:
The expression given is 3x + 2 - 3r + 7 + 5x. To simplify this expression, combine like terms. The like terms in this case are the terms with x. Combining 3x and 5x gives 8x. The constant terms 2 and 7 can also be combined, which gives 9. The simplified expression is therefore 8x + 9 - 3r.
To answer the question about the coefficient in the simplified expression: the coefficient is the number that is multiplied by the variable. Here, it is 8, which is the number multiplied by x. So the coefficient is not listed among the options provided.