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Simplifying 9 + 7(1 + 6r) = 27 9 + (1 * 7 + 6r * 7) = 27 9 + (7 + 42r) = 27 Combine like terms: 9 + 7 = 16 16 + 42r = 27 Solving 16 + 42r = 27 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 + 42r = 27 + -16 Combine like terms: 16 + -16 = 0 0 + 42r = 27 + -16 42r = 27 + -16 Combine like terms: 27 + -16 = 11 42r = 11 Divide each side by '42'. r = 0.2619047619 Simplifying r = 0.2619047619
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