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Simplifying 81 + -2x + 8x + 21 = 0 Reorder the terms: 81 + 21 + -2x + 8x = 0 Combine like terms: 81 + 21 = 102 102 + -2x + 8x = 0 Combine like terms: -2x + 8x = 6x 102 + 6x = 0 Solving 102 + 6x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-102' to each side of the equation. 102 + -102 + 6x = 0 + -102 Combine like terms: 102 + -102 = 0 0 + 6x = 0 + -102 6x = 0 + -102 Combine like terms: 0 + -102 = -102 6x = -102 Divide each side by '6'. x = -17 Simplifying x = -17
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