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Simplifying 9z + -12 = 6z + -21 Reorder the terms: -12 + 9z = 6z + -21 Reorder the terms: -12 + 9z = -21 + 6z Solving -12 + 9z = -21 + 6z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-6z' to each side of the equation. -12 + 9z + -6z = -21 + 6z + -6z Combine like terms: 9z + -6z = 3z -12 + 3z = -21 + 6z + -6z Combine like terms: 6z + -6z = 0 -12 + 3z = -21 + 0 -12 + 3z = -21 Add '12' to each side of the equation. -12 + 12 + 3z = -21 + 12 Combine like terms: -12 + 12 = 0 0 + 3z = -21 + 12 3z = -21 + 12 Combine like terms: -21 + 12 = -9 3z = -9 Divide each side by '3'. z = -3 Simplifying z = -3
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