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Simplifying 21x + 15 = 21x + -9 Reorder the terms: 15 + 21x = 21x + -9 Reorder the terms: 15 + 21x = -9 + 21x Add '-21x' to each side of the equation. 15 + 21x + -21x = -9 + 21x + -21x Combine like terms: 21x + -21x = 0 15 + 0 = -9 + 21x + -21x 15 = -9 + 21x + -21x Combine like terms: 21x + -21x = 0 15 = -9 + 0 15 = -9 Solving 15 = -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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