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