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= 10(2x+15)
= 20x + 150
jadi, air yang terdapat dalam 10 drum tersebut adalah ( 20x + 150) liter
b. caranya
= 4 (a-b) - 2 (a+b)- 3(a-2b)
= 4a-4b-2a-2b-3a+6b
= 4a-2a-3a-4b-2b+6b
= -a