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Simplifying r + 9 = 21 Reorder the terms: 9 + r = 21 Solving 9 + r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + r = 21 + -9 Combine like terms: 9 + -9 = 0 0 + r = 21 + -9 r = 21 + -9 Combine like terms: 21 + -9 = 12 r = 12 Simplifying r = 12
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