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Simplifying 9z + -3(2z + -4) = 15 Reorder the terms: 9z + -3(-4 + 2z) = 15 9z + (-4 * -3 + 2z * -3) = 15 9z + (12 + -6z) = 15 Reorder the terms: 12 + 9z + -6z = 15 Combine like terms: 9z + -6z = 3z 12 + 3z = 15 Solving 12 + 3z = 15 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 3z = 15 + -12 Combine like terms: 12 + -12 = 0 0 + 3z = 15 + -12 3z = 15 + -12 Combine like terms: 15 + -12 = 3 3z = 3 Divide each side by '3'. z = 1 Simplifying z = 1
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