$x^2+7x+7$
$\left(\:-3\:\right)\:-\:\left(\:-9\:\right)\:-\:\left(\:-8\:\right)\:-\:\left(\:-4\:\right)$
$-16\cdot2\cdot\left(-3\right)$
$20-\frac{200}{q+20}$
$-9x^3y^2\left(-13x^2y^5\right)$
$+9-\left(+7-12\right)+\left(+4-6\right)$
$-a+4a$
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