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Simplifying -9 * 7z + -1 + -3 = -57 Multiply -9 * 7 -63z + -1 + -3 = -57 Reorder the terms: -1 + -3 + -63z = -57 Combine like terms: -1 + -3 = -4 -4 + -63z = -57 Solving -4 + -63z = -57 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 + -63z = -57 + 4 Combine like terms: -4 + 4 = 0 0 + -63z = -57 + 4 -63z = -57 + 4 Combine like terms: -57 + 4 = -53 -63z = -53 Divide each side by '-63'. z = 0.8412698413 Simplifying z = 0.8412698413
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