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Simplifying 5z + 2(z + -4) = 20 Reorder the terms: 5z + 2(-4 + z) = 20 5z + (-4 * 2 + z * 2) = 20 5z + (-8 + 2z) = 20 Reorder the terms: -8 + 5z + 2z = 20 Combine like terms: 5z + 2z = 7z -8 + 7z = 20 Solving -8 + 7z = 20 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 7z = 20 + 8 Combine like terms: -8 + 8 = 0 0 + 7z = 20 + 8 7z = 20 + 8 Combine like terms: 20 + 8 = 28 7z = 28 Divide each side by '7'. z = 4 Simplifying z = 4
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