$6^2+12\cdot5+5^2$
$\left(-3a^5b^6\right)^{-2}$
$\frac{2^s+s-1}{\left(s+2\right)\left(s^2-1\right)}$
$7ab+4ab-3ab$
$\int\frac{1}{1-6x-3x^2}dx$
$\left(-16\right)\:-\:\left(-19\right)$
$\left(\frac{1}{4}-3ab\right)^2$
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