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Simplifying -8z + -1(-20) = -12 Multiply -1 * -20 -8z + 20 = -12 Reorder the terms: 20 + -8z = -12 Solving 20 + -8z = -12 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -8z = -12 + -20 Combine like terms: 20 + -20 = 0 0 + -8z = -12 + -20 -8z = -12 + -20 Combine like terms: -12 + -20 = -32 -8z = -32 Divide each side by '-8'. z = 4 Simplifying z = 4
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