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Simplifying 9[7 + -1(9 + -9r)] = 0 9[7 + (9 * -1 + -9r * -1)] = 0 9[7 + (-9 + 9r)] = 0 Combine like terms: 7 + -9 = -2 9[-2 + 9r] = 0 [-2 * 9 + 9r * 9] = 0 [-18 + 81r] = 0 Solving -18 + 81r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 81r = 0 + 18 Combine like terms: -18 + 18 = 0 0 + 81r = 0 + 18 81r = 0 + 18 Combine like terms: 0 + 18 = 18 81r = 18 Divide each side by '81'. r = 0.2222222222 Simplifying r = 0.2222222222
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