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Simplifying 3(-4z + 7) = -39 Reorder the terms: 3(7 + -4z) = -39 (7 * 3 + -4z * 3) = -39 (21 + -12z) = -39 Solving 21 + -12z = -39 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -12z = -39 + -21 Combine like terms: 21 + -21 = 0 0 + -12z = -39 + -21 -12z = -39 + -21 Combine like terms: -39 + -21 = -60 -12z = -60 Divide each side by '-12'. z = 5 Simplifying z = 5
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