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Simplifying 9x + -4 = 9x + 13 Reorder the terms: -4 + 9x = 9x + 13 Reorder the terms: -4 + 9x = 13 + 9x Add '-9x' to each side of the equation. -4 + 9x + -9x = 13 + 9x + -9x Combine like terms: 9x + -9x = 0 -4 + 0 = 13 + 9x + -9x -4 = 13 + 9x + -9x Combine like terms: 9x + -9x = 0 -4 = 13 + 0 -4 = 13 Solving -4 = 13 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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