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\begin{document}

\begin{align}
\lim_{x \to c} \left( f(x)\pm g(x)\right) 
&= \lim_{x \to c}f(x)\pm \lim_{x \to c}g(x) ,\label{eq:granice1}\\
\lim_{x \to c} \left( f(x)\cdot g(x)\right) 
&= \lim_{x \to c}f(x)\cdot \lim_{x \to c}g(x) ,\label{eq:granice2}\\
\lim_{x \to c} \frac{f(x)}{g(x)} 
&= \frac{\lim_{x \to c}f(x)}{\lim_{x \to c}g(x)},
\text{\quad gdzie } \lim_{x \to c}g(x) \ne 0\label{eq:granice3}
\end{align}

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