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Simplifying 81 = -3(3r + -3) Reorder the terms: 81 = -3(-3 + 3r) 81 = (-3 * -3 + 3r * -3) 81 = (9 + -9r) Solving 81 = 9 + -9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9r' to each side of the equation. 81 + 9r = 9 + -9r + 9r Combine like terms: -9r + 9r = 0 81 + 9r = 9 + 0 81 + 9r = 9 Add '-81' to each side of the equation. 81 + -81 + 9r = 9 + -81 Combine like terms: 81 + -81 = 0 0 + 9r = 9 + -81 9r = 9 + -81 Combine like terms: 9 + -81 = -72 9r = -72 Divide each side by '9'. r = -8 Simplifying r = -8
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