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Simplifying 21x + -5 + -13x + 4 = 18x + -3 + -10x + 16 Reorder the terms: -5 + 4 + 21x + -13x = 18x + -3 + -10x + 16 Combine like terms: -5 + 4 = -1 -1 + 21x + -13x = 18x + -3 + -10x + 16 Combine like terms: 21x + -13x = 8x -1 + 8x = 18x + -3 + -10x + 16 Reorder the terms: -1 + 8x = -3 + 16 + 18x + -10x Combine like terms: -3 + 16 = 13 -1 + 8x = 13 + 18x + -10x Combine like terms: 18x + -10x = 8x -1 + 8x = 13 + 8x Add '-8x' to each side of the equation. -1 + 8x + -8x = 13 + 8x + -8x Combine like terms: 8x + -8x = 0 -1 + 0 = 13 + 8x + -8x -1 = 13 + 8x + -8x Combine like terms: 8x + -8x = 0 -1 = 13 + 0 -1 = 13 Solving -1 = 13 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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