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Simplifying (x + -9) * 9 = 81 Reorder the terms: (-9 + x) * 9 = 81 Reorder the terms for easier multiplication: 9(-9 + x) = 81 (-9 * 9 + x * 9) = 81 (-81 + 9x) = 81 Solving -81 + 9x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '81' to each side of the equation. -81 + 81 + 9x = 81 + 81 Combine like terms: -81 + 81 = 0 0 + 9x = 81 + 81 9x = 81 + 81 Combine like terms: 81 + 81 = 162 9x = 162 Divide each side by '9'. x = 18 Simplifying x = 18
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