SOLUTION: what is the unknown of 9^x-5 = 81^x-7

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Question 434777: what is the unknown of 9^x-5 = 81^x-7
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
I presume you really meant:
+9%5E%28x-5%29+=+81%5E%28x-7%29
+9%5E%28x-5%29+=+%289%5E2%29%5E%28x-7%29
+9%5E%28x-5%29+=+9%5E%282%28x-7%29%29
+9%5E%28x-5%29+=+9%5E%282x-14%29
+x-5+=+2x-14+
+-5+=+x-14+
+9+=+x+