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Simplifying 4x + -5 + -7x = 12 + -15x + 12x + -7 Reorder the terms: -5 + 4x + -7x = 12 + -15x + 12x + -7 Combine like terms: 4x + -7x = -3x -5 + -3x = 12 + -15x + 12x + -7 Reorder the terms: -5 + -3x = 12 + -7 + -15x + 12x Combine like terms: 12 + -7 = 5 -5 + -3x = 5 + -15x + 12x Combine like terms: -15x + 12x = -3x -5 + -3x = 5 + -3x Add '3x' to each side of the equation. -5 + -3x + 3x = 5 + -3x + 3x Combine like terms: -3x + 3x = 0 -5 + 0 = 5 + -3x + 3x -5 = 5 + -3x + 3x Combine like terms: -3x + 3x = 0 -5 = 5 + 0 -5 = 5 Solving -5 = 5 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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