Answer:
-3a-4b+5
Step-by-step explanation:
(3a-6b+12)-(6a-2b+7)
3a-6b+12-6a+2b-7
3a-6a-6b+2b+12-7
14 litre
1 week = 7 days
in 1 day holly drinks 2 L water
here, 7*2=14
