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Simplifying 7z + -4 = 12 + 3z Reorder the terms: -4 + 7z = 12 + 3z Solving -4 + 7z = 12 + 3z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-3z' to each side of the equation. -4 + 7z + -3z = 12 + 3z + -3z Combine like terms: 7z + -3z = 4z -4 + 4z = 12 + 3z + -3z Combine like terms: 3z + -3z = 0 -4 + 4z = 12 + 0 -4 + 4z = 12 Add '4' to each side of the equation. -4 + 4 + 4z = 12 + 4 Combine like terms: -4 + 4 = 0 0 + 4z = 12 + 4 4z = 12 + 4 Combine like terms: 12 + 4 = 16 4z = 16 Divide each side by '4'. z = 4 Simplifying z = 4
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