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Simplifying 0 = 7z + -13z + -21 Reorder the terms: 0 = -21 + 7z + -13z Combine like terms: 7z + -13z = -6z 0 = -21 + -6z Solving 0 = -21 + -6z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '6z' to each side of the equation. 0 + 6z = -21 + -6z + 6z Remove the zero: 6z = -21 + -6z + 6z Combine like terms: -6z + 6z = 0 6z = -21 + 0 6z = -21 Divide each side by '6'. z = -3.5 Simplifying z = -3.5
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