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Simplifying -5(r + 4) = -64 Reorder the terms: -5(4 + r) = -64 (4 * -5 + r * -5) = -64 (-20 + -5r) = -64 Solving -20 + -5r = -64 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 = -64 + 20 Combine like terms: -20 + 20 = 0 0 + -5r = -64 + 20 -5r = -64 + 20 Combine like terms: -64 + 20 = -44 -5r = -44 Divide each side by '-5'. r = 8.8 Simplifying r = 8.8
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