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Simplifying 80 = -2(5z) Remove parenthesis around (5z) 80 = -2 * 5z Multiply -2 * 5 80 = -10z Solving 80 = -10z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '10z' to each side of the equation. 80 + 10z = -10z + 10z Combine like terms: -10z + 10z = 0 80 + 10z = 0 Add '-80' to each side of the equation. 80 + -80 + 10z = 0 + -80 Combine like terms: 80 + -80 = 0 0 + 10z = 0 + -80 10z = 0 + -80 Combine like terms: 0 + -80 = -80 10z = -80 Divide each side by '10'. z = -8 Simplifying z = -8
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