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Simplifying 9n + 72 = 72 + 9n Reorder the terms: 72 + 9n = 72 + 9n Add '-72' to each side of the equation. 72 + -72 + 9n = 72 + -72 + 9n Combine like terms: 72 + -72 = 0 0 + 9n = 72 + -72 + 9n 9n = 72 + -72 + 9n Combine like terms: 72 + -72 = 0 9n = 0 + 9n 9n = 9n Add '-9n' to each side of the equation. 9n + -9n = 9n + -9n Combine like terms: 9n + -9n = 0 0 = 9n + -9n Combine like terms: 9n + -9n = 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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