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Simplifying 9z + -21 = -21 + 5z Reorder the terms: -21 + 9z = -21 + 5z Add '21' to each side of the equation. -21 + 21 + 9z = -21 + 21 + 5z Combine like terms: -21 + 21 = 0 0 + 9z = -21 + 21 + 5z 9z = -21 + 21 + 5z Combine like terms: -21 + 21 = 0 9z = 0 + 5z 9z = 5z Solving 9z = 5z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-5z' to each side of the equation. 9z + -5z = 5z + -5z Combine like terms: 9z + -5z = 4z 4z = 5z + -5z Combine like terms: 5z + -5z = 0 4z = 0 Divide each side by '4'. z = 0 Simplifying z = 0
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