$13\left(20-a\right)$
$8x^2+16x+44$
$4+4\:-\left(-15\right)$
$6+7\left(3+5z\right)$
$\sqrt[2]{9x^2}$
$\left(1.5x-4\right)\left(1.5x+4\right)$
$6q+4-q+5$
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