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Simplifying -21 = 8z + 4z Combine like terms: 8z + 4z = 12z -21 = 12z Solving -21 = 12z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-12z' to each side of the equation. -21 + -12z = 12z + -12z Combine like terms: 12z + -12z = 0 -21 + -12z = 0 Add '21' to each side of the equation. -21 + 21 + -12z = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -12z = 0 + 21 -12z = 0 + 21 Combine like terms: 0 + 21 = 21 -12z = 21 Divide each side by '-12'. z = -1.75 Simplifying z = -1.75
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