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Simplifying 7x + 2x + -4 = 9x + 12 Reorder the terms: -4 + 7x + 2x = 9x + 12 Combine like terms: 7x + 2x = 9x -4 + 9x = 9x + 12 Reorder the terms: -4 + 9x = 12 + 9x Add '-9x' to each side of the equation. -4 + 9x + -9x = 12 + 9x + -9x Combine like terms: 9x + -9x = 0 -4 + 0 = 12 + 9x + -9x -4 = 12 + 9x + -9x Combine like terms: 9x + -9x = 0 -4 = 12 + 0 -4 = 12 Solving -4 = 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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