Question 1067008
.
{{{5^(x+1) + 5^(2-x)}}} = 126   ---->


x = 2.


Solved.



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Let me explain you how it SHOULD be written and posted, for your future writing:


5^(x+1) + 5^(2-x) = 126.



It was a miracle that I was able to decipher your post . . . 

It may not happen next time !!