$7p+8-5p$
$\left(2a+6\right)\left(2a-9\right)$
$-\left(-12\right)+6-\left(+2\right)-6+\left(-7\right)-2$
$x^2-9x+4x^2$
$\frac{w}{2.5}=8$
$\frac{dy}{dt}=t^2\left(1+y\right)$
$\lim_{x\to3}\left(\frac{\sin\left(9-x^2\right)}{x-3}\right)$
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