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Simplifying -3(z + -7) = 12 Reorder the terms: -3(-7 + z) = 12 (-7 * -3 + z * -3) = 12 (21 + -3z) = 12 Solving 21 + -3z = 12 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 + -3z = 12 + -21 Combine like terms: 21 + -21 = 0 0 + -3z = 12 + -21 -3z = 12 + -21 Combine like terms: 12 + -21 = -9 -3z = -9 Divide each side by '-3'. z = 3 Simplifying z = 3
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