Add (-m + 3) + (7m – 1)

The correct answer is: 6m + 2

(-m + 3) + (7m – 1)
add similar terms first that is
-terms with m : -m + 7m and
-terms without m: + 3 - 1
-m+7m+3-1 = (-1+7)m+2
= 6m + 2
-m + 7m + 3 - 1
= 6m + 2