$\int\left(\frac{2^t}{1+2^t}\right)dt$
$jgjhgmj$
$7+-1+0$
$x^2+20+x\:entre\:3-x$
$4x^2-20x+9$
$\left(2x-2\right)\left(3x+5\right)$
$6x^2-5x+3$
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