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