SOLUTION: {{ 16^(2r)= 64^(-r+1)}} please help!

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Question 454217: {{ 16^(2r)= 64^(-r+1)}}
please help!
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
%282%5E4%29%5E%282r%29+=+%282%5E6%29%5E%28-r%2B1%29
<==> 2%5E%288r%29+=+2%5E%28-6r+%2B+6%29
==> 8r = -6r + 6
==> 14r = 6
or r = 6/14 = 3/7.