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Simplifying 3x + 9 = 3x + -21 Reorder the terms: 9 + 3x = 3x + -21 Reorder the terms: 9 + 3x = -21 + 3x Add '-3x' to each side of the equation. 9 + 3x + -3x = -21 + 3x + -3x Combine like terms: 3x + -3x = 0 9 + 0 = -21 + 3x + -3x 9 = -21 + 3x + -3x Combine like terms: 3x + -3x = 0 9 = -21 + 0 9 = -21 Solving 9 = -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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