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Simplifying -5(r + 4) = -99 Reorder the terms: -5(4 + r) = -99 (4 * -5 + r * -5) = -99 (-20 + -5r) = -99 Solving -20 + -5r = -99 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + -5r = -99 + 20 Combine like terms: -20 + 20 = 0 0 + -5r = -99 + 20 -5r = -99 + 20 Combine like terms: -99 + 20 = -79 -5r = -79 Divide each side by '-5'. r = 15.8 Simplifying r = 15.8
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