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Simplifying 4r + 8 = 20 Reorder the terms: 8 + 4r = 20 Solving 8 + 4r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 4r = 20 + -8 Combine like terms: 8 + -8 = 0 0 + 4r = 20 + -8 4r = 20 + -8 Combine like terms: 20 + -8 = 12 4r = 12 Divide each side by '4'. r = 3 Simplifying r = 3
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