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Simplifying 3x + 9 = 12x + 81 Reorder the terms: 9 + 3x = 12x + 81 Reorder the terms: 9 + 3x = 81 + 12x Solving 9 + 3x = 81 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. 9 + 3x + -12x = 81 + 12x + -12x Combine like terms: 3x + -12x = -9x 9 + -9x = 81 + 12x + -12x Combine like terms: 12x + -12x = 0 9 + -9x = 81 + 0 9 + -9x = 81 Add '-9' to each side of the equation. 9 + -9 + -9x = 81 + -9 Combine like terms: 9 + -9 = 0 0 + -9x = 81 + -9 -9x = 81 + -9 Combine like terms: 81 + -9 = 72 -9x = 72 Divide each side by '-9'. x = -8 Simplifying x = -8
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