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Simplifying 1(1 + r) * 7 = 2.21 Reorder the terms for easier multiplication: 1 * 7(1 + r) = 2.21 Multiply 1 * 7 7(1 + r) = 2.21 (1 * 7 + r * 7) = 2.21 (7 + 7r) = 2.21 Solving 7 + 7r = 2.21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 7r = 2.21 + -7 Combine like terms: 7 + -7 = 0 0 + 7r = 2.21 + -7 7r = 2.21 + -7 Combine like terms: 2.21 + -7 = -4.79 7r = -4.79 Divide each side by '7'. r = -0.6842857143 Simplifying r = -0.6842857143
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