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Simplifying -5(r + 9) = -99 Reorder the terms: -5(9 + r) = -99 (9 * -5 + r * -5) = -99 (-45 + -5r) = -99 Solving -45 + -5r = -99 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + -5r = -99 + 45 Combine like terms: -45 + 45 = 0 0 + -5r = -99 + 45 -5r = -99 + 45 Combine like terms: -99 + 45 = -54 -5r = -54 Divide each side by '-5'. r = 10.8 Simplifying r = 10.8
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