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Simplifying -90 = -18z Solving -90 = -18z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '18z' to each side of the equation. -90 + 18z = -18z + 18z Combine like terms: -18z + 18z = 0 -90 + 18z = 0 Add '90' to each side of the equation. -90 + 90 + 18z = 0 + 90 Combine like terms: -90 + 90 = 0 0 + 18z = 0 + 90 18z = 0 + 90 Combine like terms: 0 + 90 = 90 18z = 90 Divide each side by '18'. z = 5 Simplifying z = 5
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