$3x+2\:.\:3x+2$
$\lim_{x\to3}\left(x^2+2x\right)$
$4ab^2+8ab^2+ab^2$
$\int - 3 x ^ { 7 } d x$
$\int\frac{8}{9x^2-36}dx$
$4x^2+6\le0$
$\left(3bc-2d\right)\left(3bc+2d\right)$
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