The solution is r < 15.We need to solve the following inequality:r - 5 < 10Recall that the process of solving an inequality is similar to that of an equation. Some of the steps are different, but the main idea is still the same. We still need to isolate the variable on one side of the equation / inequality.To isolate r, we add 5 to both sides.r < 10 + 5r < 15