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Simplifying -2(-7z + 4) + 9 = -13 Reorder the terms: -2(4 + -7z) + 9 = -13 (4 * -2 + -7z * -2) + 9 = -13 (-8 + 14z) + 9 = -13 Reorder the terms: -8 + 9 + 14z = -13 Combine like terms: -8 + 9 = 1 1 + 14z = -13 Solving 1 + 14z = -13 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 + 14z = -13 + -1 Combine like terms: 1 + -1 = 0 0 + 14z = -13 + -1 14z = -13 + -1 Combine like terms: -13 + -1 = -14 14z = -14 Divide each side by '14'. z = -1 Simplifying z = -1
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