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Simplifying 21x + -5 = 21x + 5 Reorder the terms: -5 + 21x = 21x + 5 Reorder the terms: -5 + 21x = 5 + 21x Add '-21x' to each side of the equation. -5 + 21x + -21x = 5 + 21x + -21x Combine like terms: 21x + -21x = 0 -5 + 0 = 5 + 21x + -21x -5 = 5 + 21x + -21x Combine like terms: 21x + -21x = 0 -5 = 5 + 0 -5 = 5 Solving -5 = 5 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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