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Simplifying 9z + -4(z + 5) = 40 Reorder the terms: 9z + -4(5 + z) = 40 9z + (5 * -4 + z * -4) = 40 9z + (-20 + -4z) = 40 Reorder the terms: -20 + 9z + -4z = 40 Combine like terms: 9z + -4z = 5z -20 + 5z = 40 Solving -20 + 5z = 40 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 5z = 40 + 20 Combine like terms: -20 + 20 = 0 0 + 5z = 40 + 20 5z = 40 + 20 Combine like terms: 40 + 20 = 60 5z = 60 Divide each side by '5'. z = 12 Simplifying z = 12
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