$20+90+51d$
$0.2x+1.53x-5x-x+2.8x+9x-3x$
$\lim_{x\to3}\left(\frac{2x-6}{\frac{1}{x^2}-\frac{1}{9}}\right)$
$\frac{4x^{2}-9x^{2}a^{4}}{2x+3m^{2}}$
$2\left(2\right)\left(3\left(-3\right)+4\right)$
$\int x\left(2x-1\right)e^{\left(7x\right)}dx$
$\lim_{x\to\infty}\left(\frac{x^3+3x^2-1}{x^4+5x-2}\right)$
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