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Simplifying 1800 = 10000 * 4r Multiply 10000 * 4 1800 = 40000r Solving 1800 = 40000r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-40000r' to each side of the equation. 1800 + -40000r = 40000r + -40000r Combine like terms: 40000r + -40000r = 0 1800 + -40000r = 0 Add '-1800' to each side of the equation. 1800 + -1800 + -40000r = 0 + -1800 Combine like terms: 1800 + -1800 = 0 0 + -40000r = 0 + -1800 -40000r = 0 + -1800 Combine like terms: 0 + -1800 = -1800 -40000r = -1800 Divide each side by '-40000'. r = 0.045 Simplifying r = 0.045
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