$2x^2+4x-7$
$\int\frac{\sqrt{x^2+9}}{7x^2}dx$
$m^2-10+25$
$x^5-2x^4+x^3$
$\left(7+3p^2q\right)\left(7-3p^2q\right)$
$\left(z^3\right)^4$
$a^4+4a^3+2a^2-4a-3$
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