$-19x+19z+15x-31z$
$36x^2-16$
$\sqrt{81}^{-6}$
$3x+5^2$
$\int\:\frac{3x+6}{\sqrt{2x^2+8x+3}}dx$
$-2x-8>10$
$\frac{dy}{y^2}=dx-x$
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