\(\int\dfrac1x\,\mathrm dx=\ln|x|+C\qquad x\ne0\)
\(\int\dfrac1{ax+b}\,\mathrm dx=\dfrac1a\ln|ax+b|+C\qquad a\ne0,\ ax+b\ne0\)
The power rule excludes \(n=-1\), because its denominator \(n+1\) would be zero. Use the logarithm rule instead.
Example
Integrate \(\dfrac1{3x}\) with respect to \(x\), where \(x\ne0\).
\(\int\dfrac1{3x}\,\mathrm{d}x\)\({}=\dfrac13\int\dfrac1x\,\mathrm{d}x\)\({}=\dfrac13\ln|x|+C\)
Integrate \(\dfrac1{2x+1}\) with respect to \(x\), on an interval where \(2x+1\ne0\).
\(\int\dfrac1{2x+1}\,\mathrm{d}x\)\({}=\dfrac12\ln|2x+1|+C\)
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