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Simplifying 81 = -9(r + -4) Reorder the terms: 81 = -9(-4 + r) 81 = (-4 * -9 + r * -9) 81 = (36 + -9r) Solving 81 = 36 + -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 = 36 + -9r + 9r Combine like terms: -9r + 9r = 0 81 + 9r = 36 + 0 81 + 9r = 36 Add '-81' to each side of the equation. 81 + -81 + 9r = 36 + -81 Combine like terms: 81 + -81 = 0 0 + 9r = 36 + -81 9r = 36 + -81 Combine like terms: 36 + -81 = -45 9r = -45 Divide each side by '9'. r = -5 Simplifying r = -5
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