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Simplifying -4(z + -7) = 20 Reorder the terms: -4(-7 + z) = 20 (-7 * -4 + z * -4) = 20 (28 + -4z) = 20 Solving 28 + -4z = 20 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + -4z = 20 + -28 Combine like terms: 28 + -28 = 0 0 + -4z = 20 + -28 -4z = 20 + -28 Combine like terms: 20 + -28 = -8 -4z = -8 Divide each side by '-4'. z = 2 Simplifying z = 2
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