$\left|-16\right|$
$9x^2\:+\:18x\:+\:9$
$6x^2-12x-48$
$\int\frac{1}{x^2+2x-9}dx$
$w=x^2-y^2$
$\log\left(3x-2\right)+\log\left(x+4\right)=1$
$12\cdot7b$
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