Solve h = 7(4m - 9r) for r

To solve for r, first divide both sides by 7:

h/7 = 4m - 9r

Next, isolate the term with r by subtracting 4m from both sides:

h/7 - 4m = -9r

Finally, divide both sides by -9 to solve for r:

r = (h/7 - 4m) / -9

Therefore, the final answer for r is r = (h/7 - 4m) / -9.