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Simplifying 21x + -8 + -15x + 3 = 21x + -4 + -15x + 15 Reorder the terms: -8 + 3 + 21x + -15x = 21x + -4 + -15x + 15 Combine like terms: -8 + 3 = -5 -5 + 21x + -15x = 21x + -4 + -15x + 15 Combine like terms: 21x + -15x = 6x -5 + 6x = 21x + -4 + -15x + 15 Reorder the terms: -5 + 6x = -4 + 15 + 21x + -15x Combine like terms: -4 + 15 = 11 -5 + 6x = 11 + 21x + -15x Combine like terms: 21x + -15x = 6x -5 + 6x = 11 + 6x Add '-6x' to each side of the equation. -5 + 6x + -6x = 11 + 6x + -6x Combine like terms: 6x + -6x = 0 -5 + 0 = 11 + 6x + -6x -5 = 11 + 6x + -6x Combine like terms: 6x + -6x = 0 -5 = 11 + 0 -5 = 11 Solving -5 = 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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