$\left(2b-2a+c\right)-\left(5b+3a-3c\right)$
$\log_{x+3}\left(6\right)$
$4\left(x+2\right)-20\left(x-6\right)$
$4x^2+4x+49$
$4\cdot\sen^{2}x-1=0$
$y=\:lm\:cos\:\frac{3x^2+5x}{2x^3}$
$\left(n+2\right)x^{m+3}+5x^2+x^{p-m}+2x^n$
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