$1.2+1.7x=30-1.5x$
$\csc\left(2a\right)-\tan\left(a\right)=\cot\left(2a\right)$
$8mx-5n-4mx+n$
$\frac{\left(-ln\left(x\right)-1\right)}{x}$
$\lim_{x\to5}\left(\frac{\pi x}{x^2-10x+25}\right)$
$\tan x\cos^2x\csc^2x=\cot x$
$x^2-2x+1=3$
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