Помогите с решением 4 пределов, пожалуйста!

[tex]\mathtt{1)~\lim_{x\to\infty}\frac{2x^3+7x-3}{6x^3-4x+3}}\\\mathtt{2)~\lim_{x\to3}\frac{x^2-9}{x^2-2x-3}}\\\mathtt{3)~\lim_{x\to-3}\frac{\sqrt{x+10}-\sqrt{4-x}}{2x^2-x-21}}\\\mathtt{4)~\lim_{x\to \infty}(\frac{2x-1}{2x+1})^{3x}}[/tex]
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