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Simplifying 21x + -5 + -16x + 4 = 21x + -5 + -16x + 16 Reorder the terms: -5 + 4 + 21x + -16x = 21x + -5 + -16x + 16 Combine like terms: -5 + 4 = -1 -1 + 21x + -16x = 21x + -5 + -16x + 16 Combine like terms: 21x + -16x = 5x -1 + 5x = 21x + -5 + -16x + 16 Reorder the terms: -1 + 5x = -5 + 16 + 21x + -16x Combine like terms: -5 + 16 = 11 -1 + 5x = 11 + 21x + -16x Combine like terms: 21x + -16x = 5x -1 + 5x = 11 + 5x Add '-5x' to each side of the equation. -1 + 5x + -5x = 11 + 5x + -5x Combine like terms: 5x + -5x = 0 -1 + 0 = 11 + 5x + -5x -1 = 11 + 5x + -5x Combine like terms: 5x + -5x = 0 -1 = 11 + 0 -1 = 11 Solving -1 = 11 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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