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Simplifying -90 = -9(2 + 2z) -90 = (2 * -9 + 2z * -9) -90 = (-18 + -18z) Solving -90 = -18 + -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 = -18 + -18z + 18z Combine like terms: -18z + 18z = 0 -90 + 18z = -18 + 0 -90 + 18z = -18 Add '90' to each side of the equation. -90 + 90 + 18z = -18 + 90 Combine like terms: -90 + 90 = 0 0 + 18z = -18 + 90 18z = -18 + 90 Combine like terms: -18 + 90 = 72 18z = 72 Divide each side by '18'. z = 4 Simplifying z = 4
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