$a+b\:restar\:a-b$
$-3a^xb^nc\left(-69^3b^4c\right)$
$5^{x^2-99}=25^x$
$-\left(-9c-5.9d+7.9\right)$
$\left|x^3-8\right|-\left|x-2\right|$
$\sqrt{486}$
$-\frac{1}{2}\ln\left(1-2y\right)=\frac{x^2}{2}+c$
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