$2\:+\:20z\:-\:8z\:+\:5\:x\:7$
$\int\frac{3x^3+4x^2-20x-27}{x^2-9}dx$
$\int\sqrt{7x+6\:}dx$
$y+x+y+y+x$
$.5^2$
$x\frac{dy}{dx}=4y-3x^3$
$2x-50=0$
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