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Simplifying 81 = 3r + -7 Reorder the terms: 81 = -7 + 3r Solving 81 = -7 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. 81 + -3r = -7 + 3r + -3r Combine like terms: 3r + -3r = 0 81 + -3r = -7 + 0 81 + -3r = -7 Add '-81' to each side of the equation. 81 + -81 + -3r = -7 + -81 Combine like terms: 81 + -81 = 0 0 + -3r = -7 + -81 -3r = -7 + -81 Combine like terms: -7 + -81 = -88 -3r = -88 Divide each side by '-3'. r = 29.33333333 Simplifying r = 29.33333333
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