$\left(\frac{m^2}{2}-6n\right)^2$
$\lim_{x\to\infty}\left(\sqrt{x^2+2x}-2\right)$
$42.9-98$
$-21x^4+9x^4$
$-3-x-2x+3x^2$
$kp\cdot\frac{2}{s+5}$
$4xy-3xy+5xy-12xy$
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