$-16+\left(-7\right)-\left(38-17\right)-\left(-15-19\right)$
$\left(a+7\right)^2+\left(a-7\right)^2-2\left(a^2-5\right)$
$x^2-2x+1=\left(x-1\right)^2$
$\int\frac{-4x+6}{x^2-2x+3}dx$
$2x+9>3x$
$16^{6}$
$\frac{x^2+13x+40}{x^2-2x-35}$
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