SOLUTION: The sum of the ages of Austin and Linda is 72 years. 6 years ago, Austin's age was two times Linda's age. How old is Austin now?

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Question 1017211: The sum of the ages of Austin and Linda is 72 years. 6 years ago, Austin's age was two times Linda's age. How old is Austin now?
Answer by addingup(3677) About Me  (Show Source):
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A+L = 72
A-6 = 2(L-6)
A-6 = 2L-12 Substitute for L:
A-6 = 2(72-A)-12
A-6 = 144-2A-12
A-6 = 132-2A
3A = 126 divide both sides by 3:
A = 42