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Simplifying 81 = 45 + 5r Solving 81 = 45 + 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. 81 + -5r = 45 + 5r + -5r Combine like terms: 5r + -5r = 0 81 + -5r = 45 + 0 81 + -5r = 45 Add '-81' to each side of the equation. 81 + -81 + -5r = 45 + -81 Combine like terms: 81 + -81 = 0 0 + -5r = 45 + -81 -5r = 45 + -81 Combine like terms: 45 + -81 = -36 -5r = -36 Divide each side by '-5'. r = 7.2 Simplifying r = 7.2
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