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Simplifying -9(x + -4) = -81 Reorder the terms: -9(-4 + x) = -81 (-4 * -9 + x * -9) = -81 (36 + -9x) = -81 Solving 36 + -9x = -81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + -9x = -81 + -36 Combine like terms: 36 + -36 = 0 0 + -9x = -81 + -36 -9x = -81 + -36 Combine like terms: -81 + -36 = -117 -9x = -117 Divide each side by '-9'. x = 13 Simplifying x = 13
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