$134-\left(-156-218-134\right)$
$x^3y+\frac{3}{5}x^3y^2$
$2+2^2+2^3+2^4+2^5+2^6+2^7$
$7v\:+\:2\:+\:12\:+\:2v$
$9x^2-x+4$
$\int\frac{25-x^2}{x^4}dx$
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