$a^2-\:81$
$\frac{dy}{dx}=\frac{x^2+y^2}{xy}\:\:\:\:;\:y\left(1\right)=-2$
$4xy-\left(-12xy\right)$
$8.53\cdot53$
$4y^2-8y+3$
$2 h + 4 h - 7$
$\frac{5}{6}\left(6x+12\right)+1=\frac{2}{3}\left(9x-3\right)+4$
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