how do u solve this:


x/x+3 + 5/x-7=30/x^2-4x-21:cool:

I assume this is what you mean. Please use grouping symbols.

\frac{x}{x+3}+\frac{5}{x-7}=\frac{30}{x^{2}-4x-21}

Like any fraction, multiply through by the LCD. What is the LCD you ask? The quadratic in the denominator can be factored. That ought to be a big hint.