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Simplifying r + 16 = 20 Reorder the terms: 16 + r = 20 Solving 16 + r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-16' to each side of the equation. 16 + -16 + r = 20 + -16 Combine like terms: 16 + -16 = 0 0 + r = 20 + -16 r = 20 + -16 Combine like terms: 20 + -16 = 4 r = 4 Simplifying r = 4
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