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Simplifying 7x + 5x + 9 = 81 Reorder the terms: 9 + 7x + 5x = 81 Combine like terms: 7x + 5x = 12x 9 + 12x = 81 Solving 9 + 12x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 12x = 81 + -9 Combine like terms: 9 + -9 = 0 0 + 12x = 81 + -9 12x = 81 + -9 Combine like terms: 81 + -9 = 72 12x = 72 Divide each side by '12'. x = 6 Simplifying x = 6
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