If 1x+1y=1z\frac{1}{x} + \frac{1}{y} = \frac{1}{z}x1+y1=z1, express xxx in terms of yyy and zzz.
x=yzy−zx = \frac{yz}{y-z}x=y−zyz
x=y−zyzx = \frac{y-z}{yz}x=yzy−z
x=yzz−yx = \frac{yz}{z-y}x=z−yyz
x=y−zx = y-zx=y−z