$81-36a+4a^2$
$5x^2+20x-60$
$3\left(-3\right)^4-3\left(-3\right)^3-\left(-3\right)^2+3\left(-3\right)-1\:$
$9+4-3-5+10$
$8x+2>6x-1$
$\sqrt[-1]{15}$
$5x-2\:para\:x=-4$
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