Question 640353
{{{x/r}}} - h = 4; that means r can't equal 0, (division by 0 is frowned upon)
add h to both sides
{{{x/r}}} - h + h = h + 4
{{{x/r}}} = h + 4
multiply both sides by r
r*{{{x/r}}} = r(h+4)
cancel r on the left
x = r(h+4)
or
x = hr + 4r