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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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