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Simplifying 9(z + -1) = 9z + -8 Reorder the terms: 9(-1 + z) = 9z + -8 (-1 * 9 + z * 9) = 9z + -8 (-9 + 9z) = 9z + -8 Reorder the terms: -9 + 9z = -8 + 9z Add '-9z' to each side of the equation. -9 + 9z + -9z = -8 + 9z + -9z Combine like terms: 9z + -9z = 0 -9 + 0 = -8 + 9z + -9z -9 = -8 + 9z + -9z Combine like terms: 9z + -9z = 0 -9 = -8 + 0 -9 = -8 Solving -9 = -8 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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