SOLUTION: the age of a crocodile 13 years ago was 1/3 of its age 7 years from now. How old is the crocodile at present?

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Question 577775: the age of a crocodile 13 years ago was 1/3 of its age 7 years from now. How old is the crocodile at present?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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the age of a crocodile 13 years ago was 1/3 of its age 7 years from now.
How old is the crocodile at present?
:
The equation for this:
x - 13 = 1%2F3(x+7)
multiply both sides by 3
3(x-13) = x + 7
3x - 39 = x + 7
3x - x = 7 + 39
2x = 46
x = 46/2
x = 23 yrs is the present age