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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 = 12 -20z = 12 Divide each side by '-20'. z = -0.6 Simplifying z = -0.6
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