Group like terms first
3a-6a+2ab-ab+2b
add
-3a+ab+2b
that is simplified
Answer:
60 days
Step-by-step explanation:
Let's call h the daily dose of medication that a diabetic person should administer.
We know that:
h = 0.0005 L/day
We know that 0.03 liters is what the social institution provides.
Then we can raise the following equation:
hx = 0.03
Where x is the number of days
So:

x = 60 days.
After 60 days you will have to return for more doses