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Simplifying 4(r + 9) + 4r = 108 Reorder the terms: 4(9 + r) + 4r = 108 (9 * 4 + r * 4) + 4r = 108 (36 + 4r) + 4r = 108 Combine like terms: 4r + 4r = 8r 36 + 8r = 108 Solving 36 + 8r = 108 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + 8r = 108 + -36 Combine like terms: 36 + -36 = 0 0 + 8r = 108 + -36 8r = 108 + -36 Combine like terms: 108 + -36 = 72 8r = 72 Divide each side by '8'. r = 9 Simplifying r = 9
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