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Simplifying 15 = -2(z + -1) Reorder the terms: 15 = -2(-1 + z) 15 = (-1 * -2 + z * -2) 15 = (2 + -2z) Solving 15 = 2 + -2z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '2z' to each side of the equation. 15 + 2z = 2 + -2z + 2z Combine like terms: -2z + 2z = 0 15 + 2z = 2 + 0 15 + 2z = 2 Add '-15' to each side of the equation. 15 + -15 + 2z = 2 + -15 Combine like terms: 15 + -15 = 0 0 + 2z = 2 + -15 2z = 2 + -15 Combine like terms: 2 + -15 = -13 2z = -13 Divide each side by '2'. z = -6.5 Simplifying z = -6.5
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