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Simplifying -1(90) = -45z Multiply -1 * 90 -90 = -45z Solving -90 = -45z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '45z' to each side of the equation. -90 + 45z = -45z + 45z Combine like terms: -45z + 45z = 0 -90 + 45z = 0 Add '90' to each side of the equation. -90 + 90 + 45z = 0 + 90 Combine like terms: -90 + 90 = 0 0 + 45z = 0 + 90 45z = 0 + 90 Combine like terms: 0 + 90 = 90 45z = 90 Divide each side by '45'. z = 2 Simplifying z = 2
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