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Simplifying 4 + 9(z + 5) = 31 Reorder the terms: 4 + 9(5 + z) = 31 4 + (5 * 9 + z * 9) = 31 4 + (45 + 9z) = 31 Combine like terms: 4 + 45 = 49 49 + 9z = 31 Solving 49 + 9z = 31 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-49' to each side of the equation. 49 + -49 + 9z = 31 + -49 Combine like terms: 49 + -49 = 0 0 + 9z = 31 + -49 9z = 31 + -49 Combine like terms: 31 + -49 = -18 9z = -18 Divide each side by '9'. z = -2 Simplifying z = -2
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