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Simplifying 3(7 + x) = 39 (7 * 3 + x * 3) = 39 (21 + 3x) = 39 Solving 21 + 3x = 39 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3x = 39 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 39 + -21 3x = 39 + -21 Combine like terms: 39 + -21 = 18 3x = 18 Divide each side by '3'. x = 6 Simplifying x = 6
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