$2x+11+6x$
$j^2+16j=25$
$\cos\left(3x\right)\cdot\cos\left(4x\right)$
$\left(2b\right)^{-2}$
$\lim_{x\to3}\left(\frac{x+4}{x^2-9}\right)$
$3\left(n+1\right)=5\left(n-3\right)$
$\left(4\sqrt{x}-2\right)^2$
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