It's not entirely clear to me what you're trying to solve, but it looks like the initial equation is
First convert each term into a fraction with the same (i.e. the least common) denominator. The first term needs to be multiplied by <em>a</em> + 2; the second term by (<em>a</em> + 3) (<em>a</em> + 2); and the third term by <em>a</em> + 3 :
Now that everything has the same denominator, we can combine the fractions into one. Move every term to one side and join the numerators:
Simplify the numerator:
If neither <em>a</em> = -3 nor <em>a</em> = -2, we can ignore the denominator:
Solve for <em>a</em> :