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Simplifying 3x + 4(x + 13) = 129 Reorder the terms: 3x + 4(13 + x) = 129 3x + (13 * 4 + x * 4) = 129 3x + (52 + 4x) = 129 Reorder the terms: 52 + 3x + 4x = 129 Combine like terms: 3x + 4x = 7x 52 + 7x = 129 Solving 52 + 7x = 129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-52' to each side of the equation. 52 + -52 + 7x = 129 + -52 Combine like terms: 52 + -52 = 0 0 + 7x = 129 + -52 7x = 129 + -52 Combine like terms: 129 + -52 = 77 7x = 77 Divide each side by '7'. x = 11 Simplifying x = 11
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