$-\left(8+4\right)+\left(7-9\right)$
$9x^4-1$
$\:\:100y^2\:+\:100y\:+\:25$
$x^4-12x^3+35x^2$
$\int\left(3x^2+5\right)^7dx$
$\int\left(\frac{45x^4-8}{9x^5-8x}\right)dx$
$\left(\frac{2}{3}a+\frac{2}{5}b\right)^5$
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