Question 434663
4^(x+3) = 3^(-x)
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(x+3)*log(4) = -x*log(3)
x*log(4) + 3log(4) = -x*log(3)
x(log(4) + log(3)) = -3log(4)
x*log(12) = log(1/64)
x = log(1/64)/log(12)
x =~ -1.67366