Answer:
7.6 repeating
23÷3=7.6 repeating it's a line over the 6
Remove unnecessary parenthesis.
-5k 3 - 6k +1 - 6k 2 + 5k (simplify each term) -15k - 6k + 1 - 12k +5k = -28k +1
Answer: 28k + 1
Let the second no. be x
-3x = 21 → x = 21/-3 → x = -7