### Instruction: Simplify $(3x-8)+(5x+7)$.### Response: To simplify this expression, I need to combine like terms.
That means I need to add the coefficients of x together and the constant terms together.
The coefficients of x are 3 and 5, so I can add them to get 8x.
The constant terms are -8 and 7, so I can add them to get -1.