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Simplifying 21 = 7z + -9z Combine like terms: 7z + -9z = -2z 21 = -2z Solving 21 = -2z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '2z' to each side of the equation. 21 + 2z = -2z + 2z Combine like terms: -2z + 2z = 0 21 + 2z = 0 Add '-21' to each side of the equation. 21 + -21 + 2z = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 2z = 0 + -21 2z = 0 + -21 Combine like terms: 0 + -21 = -21 2z = -21 Divide each side by '2'. z = -10.5 Simplifying z = -10.5
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