7(2^b) = 815

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2 Answers

7*(2^b)=815

2^b=815/7=116.42857

log2 (2^b)=b*log2(2)=b

=log2(116.42857)

=6.863301309

....2^6=64

2^7=128
by
lnx+ln18=1n27
by

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