$a-3b+5c-5a+8b-5c+11a-b+c$
$\lim_{x\to infinito}\left(1-\frac{2}{x}\right)^{3x}$
$3.5x\left(-2.9\right)$
$\int\sec\left(x\right)^25xdx$
$\left(2x+7\right)\cdot\left(2x-8\right)$
$x+3=3x+1$
$\left(25x^2-10x+1\right)^2$
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