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Simplifying -5x + x + 9 = -4x + 12 Reorder the terms: 9 + -5x + x = -4x + 12 Combine like terms: -5x + x = -4x 9 + -4x = -4x + 12 Reorder the terms: 9 + -4x = 12 + -4x Add '4x' to each side of the equation. 9 + -4x + 4x = 12 + -4x + 4x Combine like terms: -4x + 4x = 0 9 + 0 = 12 + -4x + 4x 9 = 12 + -4x + 4x Combine like terms: -4x + 4x = 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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