$\left(9a+7b^6\right)\left(81a^2-63ab^2+49b^4\right)$
$3x^2-7x-1=0$
$1+-64$
$9x^2-8x+1$
$\lim_{x\to-2}\:\:x^2-4\:\:x+2$
$-44-\left(-11\right)-\left(17\right)$
$5a-3a+4b+b$
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