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Evaluate $\displaystyle \lim_{x \to 7} \ (x + 7)$.

Evaluate

$\lim_{x \to -2}\frac{x^2 -4}{x+2}.$

$\lim_{t \to 1} \frac{t^2+t-2}{t^2-1}.$

$\lim_{x \to 0} \frac{x^2 - 5x + 4}{x^3 - 4x^2}.$

$\lim_{x \to 2} \frac{x+4}{x+1}.$

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