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Simplifying 13z + -12z + 8 = -20 Reorder the terms: 8 + 13z + -12z = -20 Combine like terms: 13z + -12z = 1z 8 + 1z = -20 Solving 8 + 1z = -20 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 1z = -20 + -8 Combine like terms: 8 + -8 = 0 0 + 1z = -20 + -8 1z = -20 + -8 Combine like terms: -20 + -8 = -28 1z = -28 Divide each side by '1'. z = -28 Simplifying z = -28
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