$b-4=9$
$8x^6-125$
$\frac{91}{13}-9\cdot8+\frac{345}{5}$
$\left(1-\frac{1}{\sec\left(x\right)}\right)\left(1+\sec\left(x\right)\right)=0$
$-23-\left(2+3\right)$
$\frac{4ac}{2}+\frac{b}{2}$
$f\left(x\right)=3x^2-2x-5\:entre\:x+1$
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