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Simplifying 3x + 9 = x + 12 Reorder the terms: 9 + 3x = x + 12 Reorder the terms: 9 + 3x = 12 + x Solving 9 + 3x = 12 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 9 + 3x + -1x = 12 + x + -1x Combine like terms: 3x + -1x = 2x 9 + 2x = 12 + x + -1x Combine like terms: x + -1x = 0 9 + 2x = 12 + 0 9 + 2x = 12 Add '-9' to each side of the equation. 9 + -9 + 2x = 12 + -9 Combine like terms: 9 + -9 = 0 0 + 2x = 12 + -9 2x = 12 + -9 Combine like terms: 12 + -9 = 3 2x = 3 Divide each side by '2'. x = 1.5 Simplifying x = 1.5
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