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Simplifying 3x + -9 = 7x + -4 + -4x Reorder the terms: -9 + 3x = 7x + -4 + -4x Reorder the terms: -9 + 3x = -4 + 7x + -4x Combine like terms: 7x + -4x = 3x -9 + 3x = -4 + 3x Add '-3x' to each side of the equation. -9 + 3x + -3x = -4 + 3x + -3x Combine like terms: 3x + -3x = 0 -9 + 0 = -4 + 3x + -3x -9 = -4 + 3x + -3x Combine like terms: 3x + -3x = 0 -9 = -4 + 0 -9 = -4 Solving -9 = -4 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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