Answer :
Step-by-step explanation: Hey mate, here you go
9s +18s +30 + 18s =21s
45s + 30 =21s
45s -21s = -30
24s = -30
S = -30/24
S = -5/4
Hope this helps you. Please mark me as brainliest
Step-by-step explanation: Hey mate, here you go
9s +18s +30 + 18s =21s
45s + 30 =21s
45s -21s = -30
24s = -30
S = -30/24
S = -5/4
Hope this helps you. Please mark me as brainliest