Question Help Solve for x

Question

W =2YZ+2YX+2ZX

Answer 1

W  =  2YZ + 2YX + 2ZX

Subtract "2YZ" from each side

W - 2YZ  =  2YZ + 2YX + 2ZX - 2YZ

W - 2YZ  =  2YX + 2ZX

Take out "X" common in right side of the above quation

W - 2YZ  =  X(2Y + 2Z)

(W - 2YZ) / (2Y + 2Z) =  X

Answer : 

X =  (W - 2YZ) / (2Y + 2Z)