2 2

(3r +7r+1)+(4r -8r-2)

Combining like terms, we get:

(3r + 7r + 1) + (4r - 8r - 2) = (10r - 1) + (-4r - 2)

Now we can simplify further by adding the coefficients of the like terms:

(10r - 1) + (-4r - 2) = 6r - 3

Therefore, (3r + 7r + 1) + (4r - 8r - 2) simplifies to 6r - 3.