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Simplifying 3x + 4(2x + 1) = 81 Reorder the terms: 3x + 4(1 + 2x) = 81 3x + (1 * 4 + 2x * 4) = 81 3x + (4 + 8x) = 81 Reorder the terms: 4 + 3x + 8x = 81 Combine like terms: 3x + 8x = 11x 4 + 11x = 81 Solving 4 + 11x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 11x = 81 + -4 Combine like terms: 4 + -4 = 0 0 + 11x = 81 + -4 11x = 81 + -4 Combine like terms: 81 + -4 = 77 11x = 77 Divide each side by '11'. x = 7 Simplifying x = 7
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