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Write each exponential equation in logarithmic form: 3^7= 2187

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\bf \textit{exponential form of a logarithm}\\\\ log_a b=y \implies a^y= b\qquad\qquad % exponential notation 2nd form a^y= b\implies log_a b=y \\\\ -------------------------------\\\\ 3^7=2187\implies log_3(2187)=7
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