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