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Simplifying 81 = -9(x + -8) Reorder the terms: 81 = -9(-8 + x) 81 = (-8 * -9 + x * -9) 81 = (72 + -9x) Solving 81 = 72 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. 81 + 9x = 72 + -9x + 9x Combine like terms: -9x + 9x = 0 81 + 9x = 72 + 0 81 + 9x = 72 Add '-81' to each side of the equation. 81 + -81 + 9x = 72 + -81 Combine like terms: 81 + -81 = 0 0 + 9x = 72 + -81 9x = 72 + -81 Combine like terms: 72 + -81 = -9 9x = -9 Divide each side by '9'. x = -1 Simplifying x = -1
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