$\lim_{x\to\infty}\left(-7x^4+9x^2+100\right)$
$\int_0^78.3e^{-.029x}dx$
$7-4k+k$
$\frac{x}{4}+3x=2x-5$
$\frac{x^4+x^2+2}{x-2}$
$-3v^6+12v^5$
$3x^{-1}$
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