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Simplifying 2r + 4 = 20 Reorder the terms: 4 + 2r = 20 Solving 4 + 2r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 2r = 20 + -4 Combine like terms: 4 + -4 = 0 0 + 2r = 20 + -4 2r = 20 + -4 Combine like terms: 20 + -4 = 16 2r = 16 Divide each side by '2'. r = 8 Simplifying r = 8
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