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Simplifying 2x + 21 = 21 + 2x Reorder the terms: 21 + 2x = 21 + 2x Add '-21' to each side of the equation. 21 + -21 + 2x = 21 + -21 + 2x Combine like terms: 21 + -21 = 0 0 + 2x = 21 + -21 + 2x 2x = 21 + -21 + 2x Combine like terms: 21 + -21 = 0 2x = 0 + 2x 2x = 2x Add '-2x' to each side of the equation. 2x + -2x = 2x + -2x Combine like terms: 2x + -2x = 0 0 = 2x + -2x Combine like terms: 2x + -2x = 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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