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Simplifying 7z + 18 = 9z + 4 Reorder the terms: 18 + 7z = 9z + 4 Reorder the terms: 18 + 7z = 4 + 9z Solving 18 + 7z = 4 + 9z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-9z' to each side of the equation. 18 + 7z + -9z = 4 + 9z + -9z Combine like terms: 7z + -9z = -2z 18 + -2z = 4 + 9z + -9z Combine like terms: 9z + -9z = 0 18 + -2z = 4 + 0 18 + -2z = 4 Add '-18' to each side of the equation. 18 + -18 + -2z = 4 + -18 Combine like terms: 18 + -18 = 0 0 + -2z = 4 + -18 -2z = 4 + -18 Combine like terms: 4 + -18 = -14 -2z = -14 Divide each side by '-2'. z = 7 Simplifying z = 7
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