$81-10d+d^2$
$\lim_{x\to0}\left(\frac{x+1}{x}-\frac{2}{\sin\left(x\right)}\right)$
$4-3a^2=0$
$\log_{2x}\left(36\right)=2$
$9x^3+7x^3$
$x^2+\:6x\:+\:8$
$512+27a^9$
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