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Simplifying 9z + -7 = z + 81 Reorder the terms: -7 + 9z = z + 81 Reorder the terms: -7 + 9z = 81 + z Solving -7 + 9z = 81 + z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1z' to each side of the equation. -7 + 9z + -1z = 81 + z + -1z Combine like terms: 9z + -1z = 8z -7 + 8z = 81 + z + -1z Combine like terms: z + -1z = 0 -7 + 8z = 81 + 0 -7 + 8z = 81 Add '7' to each side of the equation. -7 + 7 + 8z = 81 + 7 Combine like terms: -7 + 7 = 0 0 + 8z = 81 + 7 8z = 81 + 7 Combine like terms: 81 + 7 = 88 8z = 88 Divide each side by '8'. z = 11 Simplifying z = 11
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