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Simplifying 7r + 8(r + 2) = 121 Reorder the terms: 7r + 8(2 + r) = 121 7r + (2 * 8 + r * 8) = 121 7r + (16 + 8r) = 121 Reorder the terms: 16 + 7r + 8r = 121 Combine like terms: 7r + 8r = 15r 16 + 15r = 121 Solving 16 + 15r = 121 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-16' to each side of the equation. 16 + -16 + 15r = 121 + -16 Combine like terms: 16 + -16 = 0 0 + 15r = 121 + -16 15r = 121 + -16 Combine like terms: 121 + -16 = 105 15r = 105 Divide each side by '15'. r = 7 Simplifying r = 7
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