$-x^2-4x+5$
$\frac{9x^2-3x+4}{3x-2}$
$\left(m-121n\right)^2$
$18x^3-45x^2$
$2334\cdot1266$
$5\left(2-x\right)-2\left(3+x\right)=-10$
$\lim_{x\to\infty}\sqrt{x}$
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