Solve for r. (Give an exact answer)
1/2r - 3 = 3 (4 - 3/2r)

Savannah is painting a striped background for a mural on a wall that is 1515 yards long. she wants a total of 9696 stripes that are all the same width. which calculation should savannah use to decide how wide to make each stripe?

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

[15 points, algebra 2]simplify the complex fraction and find the restrictions.