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Simplifying 4x + 3(x + 13) = 81 Reorder the terms: 4x + 3(13 + x) = 81 4x + (13 * 3 + x * 3) = 81 4x + (39 + 3x) = 81 Reorder the terms: 39 + 4x + 3x = 81 Combine like terms: 4x + 3x = 7x 39 + 7x = 81 Solving 39 + 7x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-39' to each side of the equation. 39 + -39 + 7x = 81 + -39 Combine like terms: 39 + -39 = 0 0 + 7x = 81 + -39 7x = 81 + -39 Combine like terms: 81 + -39 = 42 7x = 42 Divide each side by '7'. x = 6 Simplifying x = 6
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