Question 260471
Here is the original problem:
{{{S=2*pi*r*H + 2*pi*r^2}}} solve for H
step 1 - subtract 2*pi*r^2 to get
{{{S - 2*pi*r^2 = 2*pi*r*H}}}
step 2 - divide by 2pir to get
{{{S/2*pi*r - r = H}}}
step 3 - subtract fractions and get common denominator
{{{(S-2*pi*r^2)/r = H}}}