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Simplifying 5x + -15 + 3x = 7 + 8x + -21 Reorder the terms: -15 + 5x + 3x = 7 + 8x + -21 Combine like terms: 5x + 3x = 8x -15 + 8x = 7 + 8x + -21 Reorder the terms: -15 + 8x = 7 + -21 + 8x Combine like terms: 7 + -21 = -14 -15 + 8x = -14 + 8x Add '-8x' to each side of the equation. -15 + 8x + -8x = -14 + 8x + -8x Combine like terms: 8x + -8x = 0 -15 + 0 = -14 + 8x + -8x -15 = -14 + 8x + -8x Combine like terms: 8x + -8x = 0 -15 = -14 + 0 -15 = -14 Solving -15 = -14 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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