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Simplifying 21x + -7 + -15x + 3 = 21x + -4 + -15x + 13 Reorder the terms: -7 + 3 + 21x + -15x = 21x + -4 + -15x + 13 Combine like terms: -7 + 3 = -4 -4 + 21x + -15x = 21x + -4 + -15x + 13 Combine like terms: 21x + -15x = 6x -4 + 6x = 21x + -4 + -15x + 13 Reorder the terms: -4 + 6x = -4 + 13 + 21x + -15x Combine like terms: -4 + 13 = 9 -4 + 6x = 9 + 21x + -15x Combine like terms: 21x + -15x = 6x -4 + 6x = 9 + 6x Add '-6x' to each side of the equation. -4 + 6x + -6x = 9 + 6x + -6x Combine like terms: 6x + -6x = 0 -4 + 0 = 9 + 6x + -6x -4 = 9 + 6x + -6x Combine like terms: 6x + -6x = 0 -4 = 9 + 0 -4 = 9 Solving -4 = 9 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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