$\log_{10}\left(\frac{1}{x}\right)=-3$
$\left(\:4-b\right)\left(3a\:+b\right)$
$x2+19x+18$
$x^2+2x\:x^32x^2-4x-8$
$5x-11y+20x-y$
$25-49b^2$
$\frac{df}{dx}+xf=3$
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