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Simplifying 4x + 21 = 4x + -12 Reorder the terms: 21 + 4x = 4x + -12 Reorder the terms: 21 + 4x = -12 + 4x Add '-4x' to each side of the equation. 21 + 4x + -4x = -12 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + 0 = -12 + 4x + -4x 21 = -12 + 4x + -4x Combine like terms: 4x + -4x = 0 21 = -12 + 0 21 = -12 Solving 21 = -12 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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