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Simplifying -1(-1z + 4) = 21 Reorder the terms: -1(4 + -1z) = 21 (4 * -1 + -1z * -1) = 21 (-4 + 1z) = 21 Solving -4 + 1z = 21 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 + 1z = 21 + 4 Combine like terms: -4 + 4 = 0 0 + 1z = 21 + 4 1z = 21 + 4 Combine like terms: 21 + 4 = 25 1z = 25 Divide each side by '1'. z = 25 Simplifying z = 25
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