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Simplifying 21 = -3z Solving 21 = -3z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '3z' to each side of the equation. 21 + 3z = -3z + 3z Combine like terms: -3z + 3z = 0 21 + 3z = 0 Add '-21' to each side of the equation. 21 + -21 + 3z = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 3z = 0 + -21 3z = 0 + -21 Combine like terms: 0 + -21 = -21 3z = -21 Divide each side by '3'. z = -7 Simplifying z = -7
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