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Simplifying 8z + -21 = -30 + 9z Reorder the terms: -21 + 8z = -30 + 9z Solving -21 + 8z = -30 + 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 + 8z + -9z = -30 + 9z + -9z Combine like terms: 8z + -9z = -1z -21 + -1z = -30 + 9z + -9z Combine like terms: 9z + -9z = 0 -21 + -1z = -30 + 0 -21 + -1z = -30 Add '21' to each side of the equation. -21 + 21 + -1z = -30 + 21 Combine like terms: -21 + 21 = 0 0 + -1z = -30 + 21 -1z = -30 + 21 Combine like terms: -30 + 21 = -9 -1z = -9 Divide each side by '-1'. z = 9 Simplifying z = 9
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