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Simplifying 5(1 + 8r) + -2 = -397 (1 * 5 + 8r * 5) + -2 = -397 (5 + 40r) + -2 = -397 Reorder the terms: 5 + -2 + 40r = -397 Combine like terms: 5 + -2 = 3 3 + 40r = -397 Solving 3 + 40r = -397 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 40r = -397 + -3 Combine like terms: 3 + -3 = 0 0 + 40r = -397 + -3 40r = -397 + -3 Combine like terms: -397 + -3 = -400 40r = -400 Divide each side by '40'. r = -10 Simplifying r = -10
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