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Simplifying -3(4r + 5) = -99 Reorder the terms: -3(5 + 4r) = -99 (5 * -3 + 4r * -3) = -99 (-15 + -12r) = -99 Solving -15 + -12r = -99 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -12r = -99 + 15 Combine like terms: -15 + 15 = 0 0 + -12r = -99 + 15 -12r = -99 + 15 Combine like terms: -99 + 15 = -84 -12r = -84 Divide each side by '-12'. r = 7 Simplifying r = 7
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