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Simplifying r + -1(-17) = 12 Multiply -1 * -17 r + 17 = 12 Reorder the terms: 17 + r = 12 Solving 17 + r = 12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-17' to each side of the equation. 17 + -17 + r = 12 + -17 Combine like terms: 17 + -17 = 0 0 + r = 12 + -17 r = 12 + -17 Combine like terms: 12 + -17 = -5 r = -5 Simplifying r = -5

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