Add 9 to isolate variable: Isolate the variable term by adding 9 to both sides of the inequality.-9 - 2r + 9 < -1 + 9-2r < 8
Divide by ext{-}2 to solve: Divide both sides of the inequality by ext{-}2 to solve for r. Remember that dividing by a negative number reverses the inequality sign. ext{-}2r / ext{-}2 > 8 / ext{-}2r > ext{-}4
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