Simplify and combine the like terms:

2f + 7g - 6 + 8g

2f + 7g - 6 + 8g

2f + 15g - 6

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To simplify and combine like terms, we need to group together the variables with the same coefficients.

The given expression is:
2f + 7g - 6 + 8g

Let's reorder the terms:
2f - 6 + 7g + 8g

Now, let's combine the like terms. The like terms in this expression are the ones with the same variable, f and g:
2f - 6 + 7g + 8g

Adding the coefficients:
2f - 6 + (7g + 8g)

Simplifying further:
2f - 6 + 15g

Therefore, the simplified and combined expression is:
2f + 15g - 6