__17. Which of the following is an example of equation?
A. 5 + 2
B. 3x
C. 4(5 + 8x) = -44

__18. Which of the following is an example of expression?
A. 4a:5 = 10
B. 8N = 10
C. 2y-5
D.5m + 6 = 3​