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Simplifying (3x + 9) = 15 Reorder the terms: (9 + 3x) = 15 Remove parenthesis around (9 + 3x) 9 + 3x = 15 Solving 9 + 3x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 3x = 15 + -9 Combine like terms: 9 + -9 = 0 0 + 3x = 15 + -9 3x = 15 + -9 Combine like terms: 15 + -9 = 6 3x = 6 Divide each side by '3'. x = 2 Simplifying x = 2
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