$18+x=27$
$\lim_{x\to0}\left(\frac{x-1}{e^x}\right)$
$\frac{dy}{dx}=\frac{\left(sin\:\left(x\right)-2y\right)}{x}$
$\lim_{x\to2}\:\:\:\:\:\:\frac{\sqrt{2x^2+3x+1}}{x^2-2x-3}$
$\sec^2\left(3x\right)+2\tan\left(3x\right)-1=4$
$15.450+16.890$
$6x-3=3x-18$
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