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Simplifying 81 = 36 + 12r Solving 81 = 36 + 12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12r' to each side of the equation. 81 + -12r = 36 + 12r + -12r Combine like terms: 12r + -12r = 0 81 + -12r = 36 + 0 81 + -12r = 36 Add '-81' to each side of the equation. 81 + -81 + -12r = 36 + -81 Combine like terms: 81 + -81 = 0 0 + -12r = 36 + -81 -12r = 36 + -81 Combine like terms: 36 + -81 = -45 -12r = -45 Divide each side by '-12'. r = 3.75 Simplifying r = 3.75
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