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Simplifying -3(1 + -9r) = -4.2 + 27.2 (1 * -3 + -9r * -3) = -4.2 + 27.2 (-3 + 27r) = -4.2 + 27.2 Combine like terms: -4.2 + 27.2 = 23 -3 + 27r = 23 Solving -3 + 27r = 23 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 27r = 23 + 3 Combine like terms: -3 + 3 = 0 0 + 27r = 23 + 3 27r = 23 + 3 Combine like terms: 23 + 3 = 26 27r = 26 Divide each side by '27'. r = 0.962962963 Simplifying r = 0.962962963
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