To solve for h, you need to isolate/get h by itself in the equation:
s = hp + 2b Subtract 2b on both sides
s - 2b = hp + 2b - 2b
s - 2b = hp Divide p on both sides to get h by itself
[tex]\frac{s-2b}{p} =\frac{hp}{p}[/tex]
[tex]\frac{s-2b}{p} =h[/tex]
