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Simplifying 81 + -4x = 8x + -21 Reorder the terms: 81 + -4x = -21 + 8x Solving 81 + -4x = -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 + -4x + -8x = -21 + 8x + -8x Combine like terms: -4x + -8x = -12x 81 + -12x = -21 + 8x + -8x Combine like terms: 8x + -8x = 0 81 + -12x = -21 + 0 81 + -12x = -21 Add '-81' to each side of the equation. 81 + -81 + -12x = -21 + -81 Combine like terms: 81 + -81 = 0 0 + -12x = -21 + -81 -12x = -21 + -81 Combine like terms: -21 + -81 = -102 -12x = -102 Divide each side by '-12'. x = 8.5 Simplifying x = 8.5
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