The limit of a sum of two or more functions is equal to the sum of the limits of each function: $\displaystyle\lim_{x\to c}(f(x)\pm g(x))=\lim_{x\to c}(f(x))\pm\lim_{x\to c}(g(x))$
The limit of a constant is just the constant
Evaluate the limit $\lim_{x\to0}\left(-2x\right)$ by replacing all occurrences of $x$ by $0$
$x+0=x$, where $x$ is any expression
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