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Simplifying -21 + -9z = 8 + -4z Solving -21 + -9z = 8 + -4z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '4z' to each side of the equation. -21 + -9z + 4z = 8 + -4z + 4z Combine like terms: -9z + 4z = -5z -21 + -5z = 8 + -4z + 4z Combine like terms: -4z + 4z = 0 -21 + -5z = 8 + 0 -21 + -5z = 8 Add '21' to each side of the equation. -21 + 21 + -5z = 8 + 21 Combine like terms: -21 + 21 = 0 0 + -5z = 8 + 21 -5z = 8 + 21 Combine like terms: 8 + 21 = 29 -5z = 29 Divide each side by '-5'. z = -5.8 Simplifying z = -5.8
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