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Simplifying 3x + -12 + x = 15 + 4x + -3 Reorder the terms: -12 + 3x + x = 15 + 4x + -3 Combine like terms: 3x + x = 4x -12 + 4x = 15 + 4x + -3 Reorder the terms: -12 + 4x = 15 + -3 + 4x Combine like terms: 15 + -3 = 12 -12 + 4x = 12 + 4x Add '-4x' to each side of the equation. -12 + 4x + -4x = 12 + 4x + -4x Combine like terms: 4x + -4x = 0 -12 + 0 = 12 + 4x + -4x -12 = 12 + 4x + -4x Combine like terms: 4x + -4x = 0 -12 = 12 + 0 -12 = 12 Solving -12 = 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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