Simplifying algebraic expressions

[SargeUSMC]

What's the rule for simplifying expressions? An example would be:

(1/(x+h)) - (1/x)

ty

 

[Ishuda]

What's the rule for simplifying expressions? An example would be:

(1/x+h) - (1/x)

ty

If you mean two fractions, then
\(\displaystyle \frac{n_1}{d_1} + \frac{n_2}{d_2} = \frac{n_1\space *\space d_2\space +\space n_2\space *\space d_1}{d_1\space *\space d_2}\)

Remember -a = + (-1) * a = + (-a)