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Simplifying 90 + 4z + 2 + 8z + -8 = 180 Reorder the terms: 90 + 2 + -8 + 4z + 8z = 180 Combine like terms: 90 + 2 = 92 92 + -8 + 4z + 8z = 180 Combine like terms: 92 + -8 = 84 84 + 4z + 8z = 180 Combine like terms: 4z + 8z = 12z 84 + 12z = 180 Solving 84 + 12z = 180 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-84' to each side of the equation. 84 + -84 + 12z = 180 + -84 Combine like terms: 84 + -84 = 0 0 + 12z = 180 + -84 12z = 180 + -84 Combine like terms: 180 + -84 = 96 12z = 96 Divide each side by '12'. z = 8 Simplifying z = 8
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