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Simplifying 18 = 2(z + -1) Reorder the terms: 18 = 2(-1 + z) 18 = (-1 * 2 + z * 2) 18 = (-2 + 2z) Solving 18 = -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. 18 + -2z = -2 + 2z + -2z Combine like terms: 2z + -2z = 0 18 + -2z = -2 + 0 18 + -2z = -2 Add '-18' to each side of the equation. 18 + -18 + -2z = -2 + -18 Combine like terms: 18 + -18 = 0 0 + -2z = -2 + -18 -2z = -2 + -18 Combine like terms: -2 + -18 = -20 -2z = -20 Divide each side by '-2'. z = 10 Simplifying z = 10
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