$823,7-97.234$
$-m+4m-5m-\left(-9\right)$
$\frac{x}{2}+7=11$
$12zx+8zy$
$\left(-6\right)\left(97\right)$
$16x^2-121y^2$
$\frac{d}{dx}\left(5x^2+8xy+6y^2=0\right)$
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