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Simplifying 9 + -7z + -132 + -21 = 0 Reorder the terms: 9 + -132 + -21 + -7z = 0 Combine like terms: 9 + -132 = -123 -123 + -21 + -7z = 0 Combine like terms: -123 + -21 = -144 -144 + -7z = 0 Solving -144 + -7z = 0 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '144' to each side of the equation. -144 + 144 + -7z = 0 + 144 Combine like terms: -144 + 144 = 0 0 + -7z = 0 + 144 -7z = 0 + 144 Combine like terms: 0 + 144 = 144 -7z = 144 Divide each side by '-7'. z = -20.57142857 Simplifying z = -20.57142857
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