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Simplifying 91 = 7(z + 4) Reorder the terms: 91 = 7(4 + z) 91 = (4 * 7 + z * 7) 91 = (28 + 7z) Solving 91 = 28 + 7z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-7z' to each side of the equation. 91 + -7z = 28 + 7z + -7z Combine like terms: 7z + -7z = 0 91 + -7z = 28 + 0 91 + -7z = 28 Add '-91' to each side of the equation. 91 + -91 + -7z = 28 + -91 Combine like terms: 91 + -91 = 0 0 + -7z = 28 + -91 -7z = 28 + -91 Combine like terms: 28 + -91 = -63 -7z = -63 Divide each side by '-7'. z = 9 Simplifying z = 9
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