Verified answer

first, subtract everything on RHS that has no "h" in it:

S - 2πr^2 = 2πrh

second, divide a lone term with a h in it by everything not involving h:

(S - 2πr^2)/2πr = h

rearrange and simplify:

h = S//2πr - r

S = 2πr^2 + 2πrh

S = 2πr(r + h) ---------> factor out a GCF

S/[2πr] = r + h ---------> divide by 2πr

S/[2πr] -r = h -----------> minus r

S-2pir^2=2pi*r*h

h=[S-2pir^2]/(2pir)

You can't get H alone it is part of a term so you can only get the term alone which it already is

The problem is already solved.

h=(S - 2*pai*r^2)/(2*pai*r)