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Simplifying 7z + -3 + 2z + -4 = 20 Reorder the terms: -3 + -4 + 7z + 2z = 20 Combine like terms: -3 + -4 = -7 -7 + 7z + 2z = 20 Combine like terms: 7z + 2z = 9z -7 + 9z = 20 Solving -7 + 9z = 20 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 9z = 20 + 7 Combine like terms: -7 + 7 = 0 0 + 9z = 20 + 7 9z = 20 + 7 Combine like terms: 20 + 7 = 27 9z = 27 Divide each side by '9'. z = 3 Simplifying z = 3
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