1. The problem statement, all variables and given/known data 1/z - 1/2z - 1/5z = 10/(z+1) This is the equation presented right after in the textbook where the author explains how to use the LCD to convert this equation into a more understood linear equation. 2. Relevant equations Here is the example before this equation: 1/(1+x) + 1/(x-2) = x+3/(x^2-x-2) The LCD is (x+1)(x-2) This is multiplied in and then we have: (x-2)+(x+1)=x+3 then we simplify it to x=4 3. The attempt at a solution I am having troubles, I am not sure what the LCD would be, my current thoughts are: 10z(z+1) Please ask, if I left anything out.