Basic College Mathematics (9th Edition)

$\frac{1}{12}$
$-\frac{3}{4}\div(-9)$ =$\frac{3}{4}\div(9)$ Remove the negative sign =$\frac{3}{4}\times(\frac{1}{9})$ Convert division into multiplication by flipping the numerator and denominator of the divisor =$\frac{1}{4}\times(\frac{1}{3})$ Cancel the common multiples =$\frac{1}{4\times3}$ Combine and multiply the two fractions =$\frac{1}{12}$