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Simplifying 9(z + 7) = 9(z + -4) Reorder the terms: 9(7 + z) = 9(z + -4) (7 * 9 + z * 9) = 9(z + -4) (63 + 9z) = 9(z + -4) Reorder the terms: 63 + 9z = 9(-4 + z) 63 + 9z = (-4 * 9 + z * 9) 63 + 9z = (-36 + 9z) Add '-9z' to each side of the equation. 63 + 9z + -9z = -36 + 9z + -9z Combine like terms: 9z + -9z = 0 63 + 0 = -36 + 9z + -9z 63 = -36 + 9z + -9z Combine like terms: 9z + -9z = 0 63 = -36 + 0 63 = -36 Solving 63 = -36 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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