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Simplifying 7(x + 3) + 3x = 81 Reorder the terms: 7(3 + x) + 3x = 81 (3 * 7 + x * 7) + 3x = 81 (21 + 7x) + 3x = 81 Combine like terms: 7x + 3x = 10x 21 + 10x = 81 Solving 21 + 10x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 10x = 81 + -21 Combine like terms: 21 + -21 = 0 0 + 10x = 81 + -21 10x = 81 + -21 Combine like terms: 81 + -21 = 60 10x = 60 Divide each side by '10'. x = 6 Simplifying x = 6
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