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Simplifying 4x + -9 = 4x + 12 Reorder the terms: -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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