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Simplifying 9 = 7z + -23z + -21 Reorder the terms: 9 = -21 + 7z + -23z Combine like terms: 7z + -23z = -16z 9 = -21 + -16z Solving 9 = -21 + -16z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '16z' to each side of the equation. 9 + 16z = -21 + -16z + 16z Combine like terms: -16z + 16z = 0 9 + 16z = -21 + 0 9 + 16z = -21 Add '-9' to each side of the equation. 9 + -9 + 16z = -21 + -9 Combine like terms: 9 + -9 = 0 0 + 16z = -21 + -9 16z = -21 + -9 Combine like terms: -21 + -9 = -30 16z = -30 Divide each side by '16'. z = -1.875 Simplifying z = -1.875
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