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Simplifying x + x + x + 9 = x + 2x + 12 Reorder the terms: 9 + x + x + x = x + 2x + 12 Combine like terms: x + x = 2x 9 + 2x + x = x + 2x + 12 Combine like terms: 2x + x = 3x 9 + 3x = x + 2x + 12 Reorder the terms: 9 + 3x = 12 + x + 2x Combine like terms: x + 2x = 3x 9 + 3x = 12 + 3x Add '-3x' to each side of the equation. 9 + 3x + -3x = 12 + 3x + -3x Combine like terms: 3x + -3x = 0 9 + 0 = 12 + 3x + -3x 9 = 12 + 3x + -3x Combine like terms: 3x + -3x = 0 9 = 12 + 0 9 = 12 Solving 9 = 12 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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