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Simplifying 7z + -1(3z + -4) = 12 Reorder the terms: 7z + -1(-4 + 3z) = 12 7z + (-4 * -1 + 3z * -1) = 12 7z + (4 + -3z) = 12 Reorder the terms: 4 + 7z + -3z = 12 Combine like terms: 7z + -3z = 4z 4 + 4z = 12 Solving 4 + 4z = 12 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 4z = 12 + -4 Combine like terms: 4 + -4 = 0 0 + 4z = 12 + -4 4z = 12 + -4 Combine like terms: 12 + -4 = 8 4z = 8 Divide each side by '4'. z = 2 Simplifying z = 2
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