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Simplifying 3x + (x + 3) = 39 Reorder the terms: 3x + (3 + x) = 39 Remove parenthesis around (3 + x) 3x + 3 + x = 39 Reorder the terms: 3 + 3x + x = 39 Combine like terms: 3x + x = 4x 3 + 4x = 39 Solving 3 + 4x = 39 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 4x = 39 + -3 Combine like terms: 3 + -3 = 0 0 + 4x = 39 + -3 4x = 39 + -3 Combine like terms: 39 + -3 = 36 4x = 36 Divide each side by '4'. x = 9 Simplifying x = 9
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