solve h = 8(m-9r) for r

To solve for r in the equation h = 8(m-9r), we first need to isolate r on one side of the equation.

1. Distribute the 8 on the right side of the equation:
h = 8m - 72r

2. Re-arrange the equation to isolate the term -72r on one side:
8m = h + 72r

3. Subtract h from both sides of the equation:
8m - h = 72r

4. Divide by 72 on both sides to solve for r:
r = (8m - h) / 72

Therefore, the solution for r in the equation h = 8(m-9r) is r = (8m - h) / 72.