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Simplifying -9(9x + 9) = -486 Reorder the terms: -9(9 + 9x) = -486 (9 * -9 + 9x * -9) = -486 (-81 + -81x) = -486 Solving -81 + -81x = -486 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 + -81x = -486 + 81 Combine like terms: -81 + 81 = 0 0 + -81x = -486 + 81 -81x = -486 + 81 Combine like terms: -486 + 81 = -405 -81x = -405 Divide each side by '-81'. x = 5 Simplifying x = 5
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