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Simplifying -5(r + 4) = -66 Reorder the terms: -5(4 + r) = -66 (4 * -5 + r * -5) = -66 (-20 + -5r) = -66 Solving -20 + -5r = -66 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 = -66 + 20 Combine like terms: -20 + 20 = 0 0 + -5r = -66 + 20 -5r = -66 + 20 Combine like terms: -66 + 20 = -46 -5r = -46 Divide each side by '-5'. r = 9.2 Simplifying r = 9.2
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