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Simplifying [2x + 9] = [2x + -9] Reorder the terms: [9 + 2x] = [2x + -9] Remove brackets around [9 + 2x] 9 + 2x = [2x + -9] Reorder the terms: 9 + 2x = [-9 + 2x] Remove brackets around [-9 + 2x] 9 + 2x = -9 + 2x Add '-2x' to each side of the equation. 9 + 2x + -2x = -9 + 2x + -2x Combine like terms: 2x + -2x = 0 9 + 0 = -9 + 2x + -2x 9 = -9 + 2x + -2x Combine like terms: 2x + -2x = 0 9 = -9 + 0 9 = -9 Solving 9 = -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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