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Simplifying -21 = 9Z Solving -21 = 9Z Solving for variable 'Z'. Move all terms containing Z to the left, all other terms to the right. Add '-9Z' to each side of the equation. -21 + -9Z = 9Z + -9Z Combine like terms: 9Z + -9Z = 0 -21 + -9Z = 0 Add '21' to each side of the equation. -21 + 21 + -9Z = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -9Z = 0 + 21 -9Z = 0 + 21 Combine like terms: 0 + 21 = 21 -9Z = 21 Divide each side by '-9'. Z = -2.333333333 Simplifying Z = -2.333333333
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