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Simplifying 4z + 9 + -2z = 45 + -2z Reorder the terms: 9 + 4z + -2z = 45 + -2z Combine like terms: 4z + -2z = 2z 9 + 2z = 45 + -2z Solving 9 + 2z = 45 + -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. 9 + 2z + 2z = 45 + -2z + 2z Combine like terms: 2z + 2z = 4z 9 + 4z = 45 + -2z + 2z Combine like terms: -2z + 2z = 0 9 + 4z = 45 + 0 9 + 4z = 45 Add '-9' to each side of the equation. 9 + -9 + 4z = 45 + -9 Combine like terms: 9 + -9 = 0 0 + 4z = 45 + -9 4z = 45 + -9 Combine like terms: 45 + -9 = 36 4z = 36 Divide each side by '4'. z = 9 Simplifying z = 9
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