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Simplifying 20 + 8x + -5 = 8x + 21 Reorder the terms: 20 + -5 + 8x = 8x + 21 Combine like terms: 20 + -5 = 15 15 + 8x = 8x + 21 Reorder the terms: 15 + 8x = 21 + 8x Add '-8x' to each side of the equation. 15 + 8x + -8x = 21 + 8x + -8x Combine like terms: 8x + -8x = 0 15 + 0 = 21 + 8x + -8x 15 = 21 + 8x + -8x Combine like terms: 8x + -8x = 0 15 = 21 + 0 15 = 21 Solving 15 = 21 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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