# Math Help - Equation

1. ## Equation

Hello. I need help with this equation.

$\opaque{}\frac 1a+\frac 1b+\frac 1c+\frac 1d = 1 \hspace{7}a,b,c,d \in N$

What is the fastest way to solve it ? THX

2. maybe a,b,c and d could be the same natural number?

3. I forgot.. a>b>c>d

4. 1/12 + 1/6 + 1/4 + ? = 1

5. It's one of many solutions wich I have to find.

6. 42,7,3,2
24,8,3,2
18,9,3,2
15,10,3,2
20,5,4,2
12,6,4,2

d = abc / (abc - ab - ac - bc) where abc > ab + ac + bc