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Simplifying 3x + -9 + 4x = 7x + 8 Reorder the terms: -9 + 3x + 4x = 7x + 8 Combine like terms: 3x + 4x = 7x -9 + 7x = 7x + 8 Reorder the terms: -9 + 7x = 8 + 7x Add '-7x' to each side of the equation. -9 + 7x + -7x = 8 + 7x + -7x Combine like terms: 7x + -7x = 0 -9 + 0 = 8 + 7x + -7x -9 = 8 + 7x + -7x Combine like terms: 7x + -7x = 0 -9 = 8 + 0 -9 = 8 Solving -9 = 8 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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