$-44-55-9-39$
$a^2+21a-20$
$-\left(\frac{16}{-8}\right)+6$
$-9v+\left(-6\right)$
$\:x\:\left(x+3\right)=\:5x+3$
$\left(3+3x^4\right)\left(3x^4-3\right)$
$sen\:30^{\circ}\:+\:tan\:37^{\circ}\:+\:sec\:60^{\circ}$
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