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Simplifying 81 = r * 27 Reorder the terms for easier multiplication: 81 = 27r Solving 81 = 27r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-27r' to each side of the equation. 81 + -27r = 27r + -27r Combine like terms: 27r + -27r = 0 81 + -27r = 0 Add '-81' to each side of the equation. 81 + -81 + -27r = 0 + -81 Combine like terms: 81 + -81 = 0 0 + -27r = 0 + -81 -27r = 0 + -81 Combine like terms: 0 + -81 = -81 -27r = -81 Divide each side by '-27'. r = 3 Simplifying r = 3
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