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Simplifying -21 + -7z = 9z + 23 Reorder the terms: -21 + -7z = 23 + 9z Solving -21 + -7z = 23 + 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. -21 + -7z + -9z = 23 + 9z + -9z Combine like terms: -7z + -9z = -16z -21 + -16z = 23 + 9z + -9z Combine like terms: 9z + -9z = 0 -21 + -16z = 23 + 0 -21 + -16z = 23 Add '21' to each side of the equation. -21 + 21 + -16z = 23 + 21 Combine like terms: -21 + 21 = 0 0 + -16z = 23 + 21 -16z = 23 + 21 Combine like terms: 23 + 21 = 44 -16z = 44 Divide each side by '-16'. z = -2.75 Simplifying z = -2.75
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