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Simplifying r + 28 = 13 Reorder the terms: 28 + r = 13 Solving 28 + r = 13 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + r = 13 + -28 Combine like terms: 28 + -28 = 0 0 + r = 13 + -28 r = 13 + -28 Combine like terms: 13 + -28 = -15 r = -15 Simplifying r = -15
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