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Simplifying 18x + 21 = 21 + 18x Reorder the terms: 21 + 18x = 21 + 18x Add '-21' to each side of the equation. 21 + -21 + 18x = 21 + -21 + 18x Combine like terms: 21 + -21 = 0 0 + 18x = 21 + -21 + 18x 18x = 21 + -21 + 18x Combine like terms: 21 + -21 = 0 18x = 0 + 18x 18x = 18x Add '-18x' to each side of the equation. 18x + -18x = 18x + -18x Combine like terms: 18x + -18x = 0 0 = 18x + -18x Combine like terms: 18x + -18x = 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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