see this attachment ☝☝☝
w in (-oo:+oo)
w/7+13 = -18 // + 18
w/7+13+18 = 0
1/7*w+31 = 0 // - 31
1/7*w = -31 // : 1/7
w = -31/1/7
w = -217
Answer:
Ten thousand times as loud.
23. 1/5 24.7/10 25. 23/50