$-\frac{672}{-28}$
$\lim_{x\to-\frac{1}{3}}\left(\frac{3x^2+2x+1}{6x+2}\right)$
$\left(t\cdot x'\right)+\left(2\cdot x\right)=5$
$\left(2x^{a+4}\:-\:8y^{a+1}\right)^3$
$\left(1-\frac{1}{t}\right)^2$
$3a^2+6a^2$
$\left(sen\:x\right)\ln\left(tan\:x\right)$
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