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Simplifying 2840 = 2300(1 + 9r) 2840 = (1 * 2300 + 9r * 2300) 2840 = (2300 + 20700r) Solving 2840 = 2300 + 20700r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20700r' to each side of the equation. 2840 + -20700r = 2300 + 20700r + -20700r Combine like terms: 20700r + -20700r = 0 2840 + -20700r = 2300 + 0 2840 + -20700r = 2300 Add '-2840' to each side of the equation. 2840 + -2840 + -20700r = 2300 + -2840 Combine like terms: 2840 + -2840 = 0 0 + -20700r = 2300 + -2840 -20700r = 2300 + -2840 Combine like terms: 2300 + -2840 = -540 -20700r = -540 Divide each side by '-20700'. r = 0.02608695652 Simplifying r = 0.02608695652
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