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It's some number that depends on what 'r' is, and
changes immediately whenever 'r' changes.
5r + 8 = -12Subtract 8 from each side:5r = -20Divide each side by 5:r = -4
If: 3r-8 = 2-2r Then: 5r = 10 And: r = 2
r+5r+5=-25
9(9p + 5r)(9p + 5r)
(5r - 4)(5r + 4)