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Simplifying 12x + 81 = 3x + 7 Reorder the terms: 81 + 12x = 3x + 7 Reorder the terms: 81 + 12x = 7 + 3x Solving 81 + 12x = 7 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 81 + 12x + -3x = 7 + 3x + -3x Combine like terms: 12x + -3x = 9x 81 + 9x = 7 + 3x + -3x Combine like terms: 3x + -3x = 0 81 + 9x = 7 + 0 81 + 9x = 7 Add '-81' to each side of the equation. 81 + -81 + 9x = 7 + -81 Combine like terms: 81 + -81 = 0 0 + 9x = 7 + -81 9x = 7 + -81 Combine like terms: 7 + -81 = -74 9x = -74 Divide each side by '9'. x = -8.222222222 Simplifying x = -8.222222222
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