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Simplifying 4(7z + 42) = 140 Reorder the terms: 4(42 + 7z) = 140 (42 * 4 + 7z * 4) = 140 (168 + 28z) = 140 Solving 168 + 28z = 140 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-168' to each side of the equation. 168 + -168 + 28z = 140 + -168 Combine like terms: 168 + -168 = 0 0 + 28z = 140 + -168 28z = 140 + -168 Combine like terms: 140 + -168 = -28 28z = -28 Divide each side by '28'. z = -1 Simplifying z = -1
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