$-7+15-8+25-17-6-18+30+0$
$2\left(x+5\right)=2x+5$
$\lim_{x\to\infty}\left(\frac{x+1}{x-2}\right)^{3x}$
$f\left(x\right)=\left(2+x\right)^2$
$4tan\left(x\right)sin\left(x\right)+3sec\left(x\right)$
$4y^2-36y^6$
$8-2k+6+9k$
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