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Simplifying 21x + -9 + -15x + 3 = 20x + -8 + -14x + 17 Reorder the terms: -9 + 3 + 21x + -15x = 20x + -8 + -14x + 17 Combine like terms: -9 + 3 = -6 -6 + 21x + -15x = 20x + -8 + -14x + 17 Combine like terms: 21x + -15x = 6x -6 + 6x = 20x + -8 + -14x + 17 Reorder the terms: -6 + 6x = -8 + 17 + 20x + -14x Combine like terms: -8 + 17 = 9 -6 + 6x = 9 + 20x + -14x Combine like terms: 20x + -14x = 6x -6 + 6x = 9 + 6x Add '-6x' to each side of the equation. -6 + 6x + -6x = 9 + 6x + -6x Combine like terms: 6x + -6x = 0 -6 + 0 = 9 + 6x + -6x -6 = 9 + 6x + -6x Combine like terms: 6x + -6x = 0 -6 = 9 + 0 -6 = 9 Solving -6 = 9 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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