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Simplifying 21x + -9 + -16x + 4 = 20x + -9 + -15x + 14 Reorder the terms: -9 + 4 + 21x + -16x = 20x + -9 + -15x + 14 Combine like terms: -9 + 4 = -5 -5 + 21x + -16x = 20x + -9 + -15x + 14 Combine like terms: 21x + -16x = 5x -5 + 5x = 20x + -9 + -15x + 14 Reorder the terms: -5 + 5x = -9 + 14 + 20x + -15x Combine like terms: -9 + 14 = 5 -5 + 5x = 5 + 20x + -15x Combine like terms: 20x + -15x = 5x -5 + 5x = 5 + 5x Add '-5x' to each side of the equation. -5 + 5x + -5x = 5 + 5x + -5x Combine like terms: 5x + -5x = 0 -5 + 0 = 5 + 5x + -5x -5 = 5 + 5x + -5x Combine like terms: 5x + -5x = 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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