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Simplifying 7z + 18 + -2z = -7 Reorder the terms: 18 + 7z + -2z = -7 Combine like terms: 7z + -2z = 5z 18 + 5z = -7 Solving 18 + 5z = -7 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 5z = -7 + -18 Combine like terms: 18 + -18 = 0 0 + 5z = -7 + -18 5z = -7 + -18 Combine like terms: -7 + -18 = -25 5z = -25 Divide each side by '5'. z = -5 Simplifying z = -5
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