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Simplifying -15 = 1 + 8r + 8 Reorder the terms: -15 = 1 + 8 + 8r Combine like terms: 1 + 8 = 9 -15 = 9 + 8r Solving -15 = 9 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. -15 + -8r = 9 + 8r + -8r Combine like terms: 8r + -8r = 0 -15 + -8r = 9 + 0 -15 + -8r = 9 Add '15' to each side of the equation. -15 + 15 + -8r = 9 + 15 Combine like terms: -15 + 15 = 0 0 + -8r = 9 + 15 -8r = 9 + 15 Combine like terms: 9 + 15 = 24 -8r = 24 Divide each side by '-8'. r = -3 Simplifying r = -3
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