$\left(9-6mn+13-12n\right)+\left(-2mn+5m-7\right)$
$\sqrt{2x-5}=7$
$xy'-4y=x^6e^x$
$-5b-3b+2b$
$x^2+2x-224$
$\int\sec\left(x-8\right)\tan\left(x-8\right)dx$
$\frac{dy}{dx}-y=7$
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