$3-a+b+2b-2c+3a+2c-3b$
$\log\left(800x+600\right)-\log x=3$
$2bd-8d+5b-20$
$\lim_{x\to-\infty}\left(\sqrt{1-2x}\right)$
$4^{-3}\cdot5^2$
$\frac{121-n^2}{1+n}$
$64x^2+48+9$
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