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Simplifying 9n + -3 = 9n + 21 Reorder the terms: -3 + 9n = 9n + 21 Reorder the terms: -3 + 9n = 21 + 9n Add '-9n' to each side of the equation. -3 + 9n + -9n = 21 + 9n + -9n Combine like terms: 9n + -9n = 0 -3 + 0 = 21 + 9n + -9n -3 = 21 + 9n + -9n Combine like terms: 9n + -9n = 0 -3 = 21 + 0 -3 = 21 Solving -3 = 21 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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