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Simplifying 21x + 105 + -84 = 21x + 105 Reorder the terms: 105 + -84 + 21x = 21x + 105 Combine like terms: 105 + -84 = 21 21 + 21x = 21x + 105 Reorder the terms: 21 + 21x = 105 + 21x Add '-21x' to each side of the equation. 21 + 21x + -21x = 105 + 21x + -21x Combine like terms: 21x + -21x = 0 21 + 0 = 105 + 21x + -21x 21 = 105 + 21x + -21x Combine like terms: 21x + -21x = 0 21 = 105 + 0 21 = 105 Solving 21 = 105 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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