SOLUTION: A square platform has a perimeter which is 9 times the length of a side, decreased by 15. Find the length of a side.

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Question 408351: A square platform has a perimeter which is 9 times the length of a side, decreased by 15. Find the length of a side.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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A square platform has a perimeter which is 9 times the length of a side, decreased by 15.
Find the length of a side.
:
Let s = the length of a side
4s = 9s - 15
+15 = 9s - 4s
15 = 5s
s = 15%2F5
s = 3 units
;
:
Check this
4(3) = 9(3) - 15
12 = 27 - 15