$\log\left(a+b\right)+\log\left(a-b\right)$
$5n+9=104$
$12a^2+48ab+8b^2$
$4+2p=10\left(\frac{3}{5}p-2\right)$
$x^2-1\cdot2x+11$
$\lim_{x\to2}\left(3-\sqrt{2x^2+x-1}\right)$
$-3x\cdot7x^{2}$
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