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Simplifying r + (r + 4) = 100 Reorder the terms: r + (4 + r) = 100 Remove parenthesis around (4 + r) r + 4 + r = 100 Reorder the terms: 4 + r + r = 100 Combine like terms: r + r = 2r 4 + 2r = 100 Solving 4 + 2r = 100 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 = 100 + -4 Combine like terms: 4 + -4 = 0 0 + 2r = 100 + -4 2r = 100 + -4 Combine like terms: 100 + -4 = 96 2r = 96 Divide each side by '2'. r = 48 Simplifying r = 48
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