-9c-12+3c=12
-9c+3c=+12+12
-6=+24
c= - 4
8^3=512
5*12=60
512+60= 572
Answer: x = 
Step-by-step explanation: Multiply -36 and 163/9 to get -652. Add 652 to both sides then add 130 and 652 to get 782. Divide both sides by -12 then reduce the fraction 782/-12 to lowest terms by extracting and canceling out 2. The system is now solved.
-18 - 30 = -48
The Scuba Diver is now 48 feet below sea level.