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