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Simplifying 3x + -3 = 81 + -9x Reorder the terms: -3 + 3x = 81 + -9x Solving -3 + 3x = 81 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. -3 + 3x + 9x = 81 + -9x + 9x Combine like terms: 3x + 9x = 12x -3 + 12x = 81 + -9x + 9x Combine like terms: -9x + 9x = 0 -3 + 12x = 81 + 0 -3 + 12x = 81 Add '3' to each side of the equation. -3 + 3 + 12x = 81 + 3 Combine like terms: -3 + 3 = 0 0 + 12x = 81 + 3 12x = 81 + 3 Combine like terms: 81 + 3 = 84 12x = 84 Divide each side by '12'. x = 7 Simplifying x = 7
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