$4^{x+2}=8^{1+x}$
$\frac{9}{11}+\frac{-4}{11}+\frac{-5}{11}$
$\log_{x+1}\left(x^2-5x-6\right)=2$
$\frac{d}{dx}x\sqrt{16-x^2}$
$6n-24$
$5x+10=2y-3$
$r^2-121$
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