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Simplifying 7200 = 4500(1 + 6r) 7200 = (1 * 4500 + 6r * 4500) 7200 = (4500 + 27000r) Solving 7200 = 4500 + 27000r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-27000r' to each side of the equation. 7200 + -27000r = 4500 + 27000r + -27000r Combine like terms: 27000r + -27000r = 0 7200 + -27000r = 4500 + 0 7200 + -27000r = 4500 Add '-7200' to each side of the equation. 7200 + -7200 + -27000r = 4500 + -7200 Combine like terms: 7200 + -7200 = 0 0 + -27000r = 4500 + -7200 -27000r = 4500 + -7200 Combine like terms: 4500 + -7200 = -2700 -27000r = -2700 Divide each side by '-27000'. r = 0.1 Simplifying r = 0.1
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