$8\frac{1}{2}+16\frac{1}{4}\cdot1$
$\tan\frac{5\pi}{7}x+\sqrt{3}=0$
$5ab+7b-12ab-5b$
$100+50+x^2$
$\left(3b\right)^3\cdot b$
$-1387-2845$
$x^2+x+1<0$
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