$\lim_{x\to1}\frac{3x}{\sqrt{x-1}}$
$3x^2+6x-x+2$
$2\sin\frac{x}{3}=1$
$3\left(2t-6\right)=2\left(3t-9\right)$
$x^2-6^2+9$
$3\left(-x+2\right)$
$4x-24$
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