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Simplifying -1(7z + 1) = -9 + 4 Reorder the terms: -1(1 + 7z) = -9 + 4 (1 * -1 + 7z * -1) = -9 + 4 (-1 + -7z) = -9 + 4 Combine like terms: -9 + 4 = -5 -1 + -7z = -5 Solving -1 + -7z = -5 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -7z = -5 + 1 Combine like terms: -1 + 1 = 0 0 + -7z = -5 + 1 -7z = -5 + 1 Combine like terms: -5 + 1 = -4 -7z = -4 Divide each side by '-7'. z = 0.5714285714 Simplifying z = 0.5714285714
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