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Simplifying 81 + -6x = 21x + 21 Reorder the terms: 81 + -6x = 21 + 21x Solving 81 + -6x = 21 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. 81 + -6x + -21x = 21 + 21x + -21x Combine like terms: -6x + -21x = -27x 81 + -27x = 21 + 21x + -21x Combine like terms: 21x + -21x = 0 81 + -27x = 21 + 0 81 + -27x = 21 Add '-81' to each side of the equation. 81 + -81 + -27x = 21 + -81 Combine like terms: 81 + -81 = 0 0 + -27x = 21 + -81 -27x = 21 + -81 Combine like terms: 21 + -81 = -60 -27x = -60 Divide each side by '-27'. x = 2.222222222 Simplifying x = 2.222222222
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