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Simplifying x + (x + 3) + (x + 6) = 12 Reorder the terms: x + (3 + x) + (x + 6) = 12 Remove parenthesis around (3 + x) x + 3 + x + (x + 6) = 12 Reorder the terms: x + 3 + x + (6 + x) = 12 Remove parenthesis around (6 + x) x + 3 + x + 6 + x = 12 Reorder the terms: 3 + 6 + x + x + x = 12 Combine like terms: 3 + 6 = 9 9 + x + x + x = 12 Combine like terms: x + x = 2x 9 + 2x + x = 12 Combine like terms: 2x + x = 3x 9 + 3x = 12 Solving 9 + 3x = 12 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 = 12 + -9 Combine like terms: 9 + -9 = 0 0 + 3x = 12 + -9 3x = 12 + -9 Combine like terms: 12 + -9 = 3 3x = 3 Divide each side by '3'. x = 1 Simplifying x = 1
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