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Simplifying 9x + -7 = 9x + -4 Reorder the terms: -7 + 9x = 9x + -4 Reorder the terms: -7 + 9x = -4 + 9x Add '-9x' to each side of the equation. -7 + 9x + -9x = -4 + 9x + -9x Combine like terms: 9x + -9x = 0 -7 + 0 = -4 + 9x + -9x -7 = -4 + 9x + -9x Combine like terms: 9x + -9x = 0 -7 = -4 + 0 -7 = -4 Solving -7 = -4 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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