Add. Simplify, if possible. $\displaystyle \frac {1} {5x} + \frac {7x} {x+5}$
$\displaystyle \frac {1} {5x} + \frac {7x} {x+5}$
$\displaystyle \frac {1*(x+5)} {5x*(x+5)} + \frac {7x*5x} {(x+5)*5x}$
$\displaystyle \frac {(x+5)+7x*5x} {5x*(x+5)}$
$\displaystyle \frac {x+5+35x^2} {5x*(x+5)}$
$\displaystyle \frac {x+5+35x^2} {5x^2+25x}$
I guess there is no way to simplify