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Simplifying r + -21 = -13 Reorder the terms: -21 + r = -13 Solving -21 + r = -13 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + r = -13 + 21 Combine like terms: -21 + 21 = 0 0 + r = -13 + 21 r = -13 + 21 Combine like terms: -13 + 21 = 8 r = 8 Simplifying r = 8
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