$4x+3+7x$
$\ln\left(6\right)-\ln\left(5x\right)=1$
$3x^2+5x+6x$
$c\log\left(a\right)-y\log\left(b\right)$
$\lim_{x\to0}\left(\frac{7x}{\cos\left(x\right)-3x+1}\right)$
$\sin\left(2x\right)=4\sin\left(2x\right)-1$
$\left(\sqrt{x}+\frac{1}{\sqrt{x}}\right)\left(\sqrt{x}-\frac{1}{\sqrt{x}}\right)$
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