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Simplifying 4r + 4(r + 3) = 428 Reorder the terms: 4r + 4(3 + r) = 428 4r + (3 * 4 + r * 4) = 428 4r + (12 + 4r) = 428 Reorder the terms: 12 + 4r + 4r = 428 Combine like terms: 4r + 4r = 8r 12 + 8r = 428 Solving 12 + 8r = 428 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 8r = 428 + -12 Combine like terms: 12 + -12 = 0 0 + 8r = 428 + -12 8r = 428 + -12 Combine like terms: 428 + -12 = 416 8r = 416 Divide each side by '8'. r = 52 Simplifying r = 52
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