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Simplifying (x + 3) + (2x + 3) = 12 Reorder the terms: (3 + x) + (2x + 3) = 12 Remove parenthesis around (3 + x) 3 + x + (2x + 3) = 12 Reorder the terms: 3 + x + (3 + 2x) = 12 Remove parenthesis around (3 + 2x) 3 + x + 3 + 2x = 12 Reorder the terms: 3 + 3 + x + 2x = 12 Combine like terms: 3 + 3 = 6 6 + x + 2x = 12 Combine like terms: x + 2x = 3x 6 + 3x = 12 Solving 6 + 3x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 3x = 12 + -6 Combine like terms: 6 + -6 = 0 0 + 3x = 12 + -6 3x = 12 + -6 Combine like terms: 12 + -6 = 6 3x = 6 Divide each side by '3'. x = 2 Simplifying x = 2
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