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Simplifying 2n + 9 = 2n + -9 Reorder the terms: 9 + 2n = 2n + -9 Reorder the terms: 9 + 2n = -9 + 2n Add '-2n' to each side of the equation. 9 + 2n + -2n = -9 + 2n + -2n Combine like terms: 2n + -2n = 0 9 + 0 = -9 + 2n + -2n 9 = -9 + 2n + -2n Combine like terms: 2n + -2n = 0 9 = -9 + 0 9 = -9 Solving 9 = -9 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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