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Simplifying 3x + (x + 7) = 39 Reorder the terms: 3x + (7 + x) = 39 Remove parenthesis around (7 + x) 3x + 7 + x = 39 Reorder the terms: 7 + 3x + x = 39 Combine like terms: 3x + x = 4x 7 + 4x = 39 Solving 7 + 4x = 39 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 4x = 39 + -7 Combine like terms: 7 + -7 = 0 0 + 4x = 39 + -7 4x = 39 + -7 Combine like terms: 39 + -7 = 32 4x = 32 Divide each side by '4'. x = 8 Simplifying x = 8
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