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Simplifying 9 = -7z + -13z + -21 Reorder the terms: 9 = -21 + -7z + -13z Combine like terms: -7z + -13z = -20z 9 = -21 + -20z Solving 9 = -21 + -20z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '20z' to each side of the equation. 9 + 20z = -21 + -20z + 20z Combine like terms: -20z + 20z = 0 9 + 20z = -21 + 0 9 + 20z = -21 Add '-9' to each side of the equation. 9 + -9 + 20z = -21 + -9 Combine like terms: 9 + -9 = 0 0 + 20z = -21 + -9 20z = -21 + -9 Combine like terms: -21 + -9 = -30 20z = -30 Divide each side by '20'. z = -1.5 Simplifying z = -1.5
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