$3\cdot\left(23-45\right)-10\cdot\left(38-39\right)$
$-7b\:+\:4\:-\:5b\:+\:2$
$\tan\left(t\right)=\frac{8}{15}$
$80:-4$
$\frac{dy}{dx}\left(x^3-2xy+y^2+x=0\right)$
$25y^2+15y=-2$
$-x^2+18x-81$
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