$\left(6b+10\right)\left(7a-2b\right)$
$12+\left(21-\left(15-\left(-4\right)\right)\right)$
$x^2+8^2$
$6-2h>30$
$11x+8+-11x+24$
$\left(5x+y\right)^4$
$\lim_{x\to-4}\left(\frac{x^2-3x-28}{x+4}\right)$
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