$3-\sqrt{x^2}+5$
$49x^6-36y^2$
$\frac{ex+f}{x^2-4}=\frac{a}{x+2}+\frac{b}{x-2}$
$3x+25=43$
$\int_{0}^{20}xe^{x^{2}}dx$
$3-5+4-2+8$
$x^3+x^2-8x-12$
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