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Simplifying 9(x + 9) = 7 + 9x Reorder the terms: 9(9 + x) = 7 + 9x (9 * 9 + x * 9) = 7 + 9x (81 + 9x) = 7 + 9x Add '-9x' to each side of the equation. 81 + 9x + -9x = 7 + 9x + -9x Combine like terms: 9x + -9x = 0 81 + 0 = 7 + 9x + -9x 81 = 7 + 9x + -9x Combine like terms: 9x + -9x = 0 81 = 7 + 0 81 = 7 Solving 81 = 7 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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