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Simplifying 9x + 21 = 21 + 9x Reorder the terms: 21 + 9x = 21 + 9x Add '-21' to each side of the equation. 21 + -21 + 9x = 21 + -21 + 9x Combine like terms: 21 + -21 = 0 0 + 9x = 21 + -21 + 9x 9x = 21 + -21 + 9x Combine like terms: 21 + -21 = 0 9x = 0 + 9x 9x = 9x Add '-9x' to each side of the equation. 9x + -9x = 9x + -9x Combine like terms: 9x + -9x = 0 0 = 9x + -9x 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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