$8.735+5.9$

$-\frac{1}{4}\left(8x+12\right)-\left(-2x+5\right)$

$\int\frac{3x^2+5x}{\left(x-1\right)\left(x+1\right)}dx$

$\left(4-5x\right)\left(1-2x\right)\left(3x+2\right)$

$\left(2s+t\right)-3\left(s-6\right)+4\left(l-t\right)$

$\frac{2}{3x}-\frac{6}{x^2}+\frac{7}{x^3}$

$-21-22$