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Simplifying 81 + -7x = 20x + 21 Reorder the terms: 81 + -7x = 21 + 20x Solving 81 + -7x = 21 + 20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20x' to each side of the equation. 81 + -7x + -20x = 21 + 20x + -20x Combine like terms: -7x + -20x = -27x 81 + -27x = 21 + 20x + -20x Combine like terms: 20x + -20x = 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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