Is this the correct working out for y^2/5 - 2 = 18 (1 Viewer)

[Jigmey]

y^2-10 = 90
y^2=100
y = +-square root of 100
y = +-10

 

[Trebla]

Correct

 

[JupiterPie]

Seems as two steps are missing. My solution is:
y^2/5 - 2 = 18
y^2/5 = 20
y^2 = 5*20
y^2 = 100
y = +- square root(100)
y = +-10