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Simplifying 9 + 8.5(1 + 3.5r) = 16.5 9 + (1 * 8.5 + 3.5r * 8.5) = 16.5 9 + (8.5 + 29.75r) = 16.5 Combine like terms: 9 + 8.5 = 17.5 17.5 + 29.75r = 16.5 Solving 17.5 + 29.75r = 16.5 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-17.5' to each side of the equation. 17.5 + -17.5 + 29.75r = 16.5 + -17.5 Combine like terms: 17.5 + -17.5 = 0.0 0.0 + 29.75r = 16.5 + -17.5 29.75r = 16.5 + -17.5 Combine like terms: 16.5 + -17.5 = -1 29.75r = -1 Divide each side by '29.75'. r = -0.03361344538 Simplifying r = -0.03361344538
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