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Simplifying -81 + -9x = 8x + 21 Reorder the terms: -81 + -9x = 21 + 8x Solving -81 + -9x = 21 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. -81 + -9x + -8x = 21 + 8x + -8x Combine like terms: -9x + -8x = -17x -81 + -17x = 21 + 8x + -8x Combine like terms: 8x + -8x = 0 -81 + -17x = 21 + 0 -81 + -17x = 21 Add '81' to each side of the equation. -81 + 81 + -17x = 21 + 81 Combine like terms: -81 + 81 = 0 0 + -17x = 21 + 81 -17x = 21 + 81 Combine like terms: 21 + 81 = 102 -17x = 102 Divide each side by '-17'. x = -6 Simplifying x = -6
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