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Simplifying 7x + 9 + -3x = 12 + 4x Reorder the terms: 9 + 7x + -3x = 12 + 4x Combine like terms: 7x + -3x = 4x 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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