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Simplifying -9(z + -8) = -9z + -72 Reorder the terms: -9(-8 + z) = -9z + -72 (-8 * -9 + z * -9) = -9z + -72 (72 + -9z) = -9z + -72 Reorder the terms: 72 + -9z = -72 + -9z Add '9z' to each side of the equation. 72 + -9z + 9z = -72 + -9z + 9z Combine like terms: -9z + 9z = 0 72 + 0 = -72 + -9z + 9z 72 = -72 + -9z + 9z Combine like terms: -9z + 9z = 0 72 = -72 + 0 72 = -72 Solving 72 = -72 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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