The answer is a=2:
Equation=
Open the parenthesis first:
-20+8a+3a-12=12-6a-5a
Add all the a's and the numbers together:
-32+11a=12-11a
Lastly put all a's on one side and the numbers on the other side:
22a=44
Divide the numbers and get:
a=2
540ml with 12% solution
get 12% of 540
540 times 0.12 = 64.8 ml of pure acid
Answer:
AEBG
Step-by-step explanation: