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Simplifying 4z + 9 + 39(2z) = 129 Remove parenthesis around (2z) 4z + 9 + 39 * 2z = 129 Multiply 39 * 2 4z + 9 + 78z = 129 Reorder the terms: 9 + 4z + 78z = 129 Combine like terms: 4z + 78z = 82z 9 + 82z = 129 Solving 9 + 82z = 129 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 82z = 129 + -9 Combine like terms: 9 + -9 = 0 0 + 82z = 129 + -9 82z = 129 + -9 Combine like terms: 129 + -9 = 120 82z = 120 Divide each side by '82'. z = 1.463414634 Simplifying z = 1.463414634
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