$13n+4=-35$
$1-2a^3+9^6$
$2.5x-10>25$
$31\cdot27$
$\left(x-5y\right)\left(x+5y\right)$
$\left(-8\right)^k\left(-8\right)^z\left(-8\right)^y\left(-8\right)^n$
$\lim_{x\to0}\left(\frac{ln\left(1-9x\right)}{x}\right)$
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