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5r + 8 = -12Subtract 8 from each side:5r = -20Divide each side by 5:r = -4
9(9p + 5r)(9p + 5r)
r+5r+5=-25
(5r - 4)(5r + 4)
Combine the ' 9r ' and the ' -5r ' . Replace them with ' 4r '.