Problem below

Question

Solve the formula for the indicated variable. 

 

1            1           1

___  -   ___   =    ___    for x.         X=??

x            y             z 

Answer 1

1.  1/x = 1/y + 1/z

2.  1/x = (z+y)/yz

3.  now solve for x by taking reciprocal of each side of the equation (in step 2).