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Simplifying 9x + 15 = 9x + -20 Reorder the terms: 15 + 9x = 9x + -20 Reorder the terms: 15 + 9x = -20 + 9x Add '-9x' to each side of the equation. 15 + 9x + -9x = -20 + 9x + -9x Combine like terms: 9x + -9x = 0 15 + 0 = -20 + 9x + -9x 15 = -20 + 9x + -9x Combine like terms: 9x + -9x = 0 15 = -20 + 0 15 = -20 Solving 15 = -20 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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