$3g^2+5g-2g^2+8$
$x-14=-21$
$\lim_{x\to-infinito}\left(\frac{3x+\left|x\right|}{7x-5\left|x\right|}\right)$
$0.20\cdot1000$
$\frac{2sin^2\left(a\right)-1}{sin\left(a\right)+cos\left(a\right)}$
$b^{-9}\cdot\left(b^2\right)^4$
$a\:2\:+6a+8\:+4a^2+8a+4$
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