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Simplifying 3x + 12 = 3x + -21 Reorder the terms: 12 + 3x = 3x + -21 Reorder the terms: 12 + 3x = -21 + 3x Add '-3x' to each side of the equation. 12 + 3x + -3x = -21 + 3x + -3x Combine like terms: 3x + -3x = 0 12 + 0 = -21 + 3x + -3x 12 = -21 + 3x + -3x Combine like terms: 3x + -3x = 0 12 = -21 + 0 12 = -21 Solving 12 = -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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