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Simplifying 8(7r + 5) = 320 Reorder the terms: 8(5 + 7r) = 320 (5 * 8 + 7r * 8) = 320 (40 + 56r) = 320 Solving 40 + 56r = 320 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + 56r = 320 + -40 Combine like terms: 40 + -40 = 0 0 + 56r = 320 + -40 56r = 320 + -40 Combine like terms: 320 + -40 = 280 56r = 280 Divide each side by '56'. r = 5 Simplifying r = 5
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