$\log\left(x\right)+log\left(x-9\right)=1$

$\left(\frac{3r}{2s}\right)\left(\frac{4s}{9r^2}\right)$

$\frac{\left(\frac{1}{6}a^2+\frac{5}{36}ab-16b^2\right)}{\frac{1}{3}a\cdot\frac{1}{2}b}$

$0.5\cdot0.5\cdot12$

$\frac{3x-3}{5}=\frac{2x-2}{4}$

$13x=91$

$\int_0^5\left(\sqrt{1+\frac{y^2}{49-y^2}}\right)dx$