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Simplifying 5(2 + 8r) + 10 = 0 (2 * 5 + 8r * 5) + 10 = 0 (10 + 40r) + 10 = 0 Reorder the terms: 10 + 10 + 40r = 0 Combine like terms: 10 + 10 = 20 20 + 40r = 0 Solving 20 + 40r = 0 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 + 40r = 0 + -20 Combine like terms: 20 + -20 = 0 0 + 40r = 0 + -20 40r = 0 + -20 Combine like terms: 0 + -20 = -20 40r = -20 Divide each side by '40'. r = -0.5 Simplifying r = -0.5
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