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Simplifying 7z + 7 = 91 Reorder the terms: 7 + 7z = 91 Solving 7 + 7z = 91 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 + 7z = 91 + -7 Combine like terms: 7 + -7 = 0 0 + 7z = 91 + -7 7z = 91 + -7 Combine like terms: 91 + -7 = 84 7z = 84 Divide each side by '7'. z = 12 Simplifying z = 12
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