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Simplifying 2n + 21 = 2n + -1 Reorder the terms: 21 + 2n = 2n + -1 Reorder the terms: 21 + 2n = -1 + 2n Add '-2n' to each side of the equation. 21 + 2n + -2n = -1 + 2n + -2n Combine like terms: 2n + -2n = 0 21 + 0 = -1 + 2n + -2n 21 = -1 + 2n + -2n Combine like terms: 2n + -2n = 0 21 = -1 + 0 21 = -1 Solving 21 = -1 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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