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Simplifying 81 + -2x = 8x + -21 Reorder the terms: 81 + -2x = -21 + 8x Solving 81 + -2x = -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 + -2x + -8x = -21 + 8x + -8x Combine like terms: -2x + -8x = -10x 81 + -10x = -21 + 8x + -8x Combine like terms: 8x + -8x = 0 81 + -10x = -21 + 0 81 + -10x = -21 Add '-81' to each side of the equation. 81 + -81 + -10x = -21 + -81 Combine like terms: 81 + -81 = 0 0 + -10x = -21 + -81 -10x = -21 + -81 Combine like terms: -21 + -81 = -102 -10x = -102 Divide each side by '-10'. x = 10.2 Simplifying x = 10.2
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