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Simplifying 21n + 21 + -18n = 9 + 3n + 12 Reorder the terms: 21 + 21n + -18n = 9 + 3n + 12 Combine like terms: 21n + -18n = 3n 21 + 3n = 9 + 3n + 12 Reorder the terms: 21 + 3n = 9 + 12 + 3n Combine like terms: 9 + 12 = 21 21 + 3n = 21 + 3n Add '-21' to each side of the equation. 21 + -21 + 3n = 21 + -21 + 3n Combine like terms: 21 + -21 = 0 0 + 3n = 21 + -21 + 3n 3n = 21 + -21 + 3n Combine like terms: 21 + -21 = 0 3n = 0 + 3n 3n = 3n Add '-3n' to each side of the equation. 3n + -3n = 3n + -3n Combine like terms: 3n + -3n = 0 0 = 3n + -3n Combine like terms: 3n + -3n = 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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