$\lim_{x\to\infty}\frac{\sqrt{4+x+x^2}-x}{x^2}$
$3m-2m+1m=150$
$\int21z^3e^zdz$
$\frac{2x^4-2x^3}{x+1}$
$\left(-1\right)\cdot\left(-18\right)$
$15x^5-3x^3\cdot4x^2$
$5x+10=2y-3$
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