$\left(-5\right)\cdot\left|\left(-17\right)-\left(-19\right)\right|+12+\left(-1\right)$

$x^2+\frac{8}{7}+0$

$6xy^218y$

$45.6\left(2.00\right)$

$\frac{\left(2\left(z+i\right)\right)^n}{n^2}$

$-3a^2+7a\frac{-3}{4}b-4a^2-12a+\frac{2}{9}b+5a^2+3a+\frac{1}{6}b+2a^2$

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