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Simplifying 9(x + -7) + 7 = 9x + 4 Reorder the terms: 9(-7 + x) + 7 = 9x + 4 (-7 * 9 + x * 9) + 7 = 9x + 4 (-63 + 9x) + 7 = 9x + 4 Reorder the terms: -63 + 7 + 9x = 9x + 4 Combine like terms: -63 + 7 = -56 -56 + 9x = 9x + 4 Reorder the terms: -56 + 9x = 4 + 9x Add '-9x' to each side of the equation. -56 + 9x + -9x = 4 + 9x + -9x Combine like terms: 9x + -9x = 0 -56 + 0 = 4 + 9x + -9x -56 = 4 + 9x + -9x Combine like terms: 9x + -9x = 0 -56 = 4 + 0 -56 = 4 Solving -56 = 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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