$\left(7a-3x^2\right)\left(7a+3x^2\right)$
$4x^2-23-6$
$x+4-00$
$a^2+2-7+2a+5$
$4x^2-12x$
$\int\frac{x^3}{x^2+3}dx$
$2-\left[-2\left(x+1\right)-\frac{x-3}{2}\right]<\frac{2x}{3}-\frac{-5x-3}{12}+3$
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