I am trying to solve an equation that involves substitution.(adsbygoogle = window.adsbygoogle || []).push({});

I was given k= 7 in the equation n=k+c

i was also given n=2^c-1

I figured that 7+c could be substituted into the equation as n, so I got

7+c=2^c-1 and therefore c=2^c-8.

The problem is that the answer I want is c=4...but substituting 4 as C does not give me a correct answer. Any help would be greatly appreciated.

Thank you

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# Solving equations via substitution

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