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Simplifying 21x + -6 + -15x + 4 = 20x + -7 + -14x + 4 Reorder the terms: -6 + 4 + 21x + -15x = 20x + -7 + -14x + 4 Combine like terms: -6 + 4 = -2 -2 + 21x + -15x = 20x + -7 + -14x + 4 Combine like terms: 21x + -15x = 6x -2 + 6x = 20x + -7 + -14x + 4 Reorder the terms: -2 + 6x = -7 + 4 + 20x + -14x Combine like terms: -7 + 4 = -3 -2 + 6x = -3 + 20x + -14x Combine like terms: 20x + -14x = 6x -2 + 6x = -3 + 6x Add '-6x' to each side of the equation. -2 + 6x + -6x = -3 + 6x + -6x Combine like terms: 6x + -6x = 0 -2 + 0 = -3 + 6x + -6x -2 = -3 + 6x + -6x Combine like terms: 6x + -6x = 0 -2 = -3 + 0 -2 = -3 Solving -2 = -3 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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