$-6-7b+2-4b$
$12r-6-12r$
$\lim_{x\to\infty}\left(1-sin\left(\frac{1}{7x}\right)\right)^{4n}$
$5s\:-\:7\:+\:t\:-\:t$
$2x^2+9x+10=0$
$9x^2+24x-16$
$\int-1sec^3\left(x\right)tan\left(x\right)dx$
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