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Simplifying 0 = -13800 + 28500[1 + -1(1 + r)] 0 = -13800 + 28500[1 + (1 * -1 + r * -1)] 0 = -13800 + 28500[1 + (-1 + -1r)] Combine like terms: 1 + -1 = 0 0 = -13800 + 28500[0 + -1r] 0 = -13800 + 28500[-1r] Remove brackets around [-1r] 0 = -13800 + 28500 * -1r Multiply 28500 * -1 0 = -13800 + -28500r Solving 0 = -13800 + -28500r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '28500r' to each side of the equation. 0 + 28500r = -13800 + -28500r + 28500r Remove the zero: 28500r = -13800 + -28500r + 28500r Combine like terms: -28500r + 28500r = 0 28500r = -13800 + 0 28500r = -13800 Divide each side by '28500'. r = -0.4842105263 Simplifying r = -0.4842105263
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