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Simplifying 2x + 13 = 2x + 21 Reorder the terms: 13 + 2x = 2x + 21 Reorder the terms: 13 + 2x = 21 + 2x Add '-2x' to each side of the equation. 13 + 2x + -2x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 13 + 0 = 21 + 2x + -2x 13 = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 13 = 21 + 0 13 = 21 Solving 13 = 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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