Answer
a) $\ln |x|+C$
b) $7\ln |x|+C$
c) $x-5\ln |x|+C$
Work Step by Step
a) The anti-derivative is:
$\dfrac{1}{x}=\ln |x|+C$
b) The anti-derivative is:
$\dfrac{7}{x}=7\ln |x|+C$
c) The anti-derivative is:
$1-\dfrac{5}{x}=x-5\ln |x|+C$