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Simplifying -13x + 4x + 9x = 0 Combine like terms: -13x + 4x = -9x -9x + 9x = 0 Combine like terms: -9x + 9x = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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