$\left(7\right)\left(4\right)-\left(5\right)^2$
$\lim_{x\to-1}\left(\frac{2x^4+6x^3+x+5}{x+1}\right)$
$3b^3+2b^3+b^3$
$sen4x+sen2x=0$
$\left(3y\right)^{-3}$
$4\left(2a\right)$
$\left(8-2\right)\left(11+9+6\right)$
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