$9x^2+30ax+25a^2$
$16\:-\:\left(\:-\:20\:+\:6\:\right)\:-\:15\:$
$-6sinx=-3\sqrt{2}$
$\frac{\left(3x+3\right)}{2x^2-x-1}$
$1\:entre\:10\:a\:la\:menos\:2$
$3a^2-5a$
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