-9r = 20 + r
subtract r from both sides
-10r = 20
divide both sides by -10
r = -2
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3r - 9r = 18 wright equaton -6r = 18 combine like terms r = -3 solve
r2 + r - 20 = 0(r + 5)(r - 4) = 0r + 5 = 0 or r - 4 = 0r = -5 or r = 4
If we assume that "r" is unknown: -9r+8 or 8-9r It cannot be simplified further.
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9r-- think of the 'r' as '1r' and add like you normally would.