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Simplifying 21 = 9z + -5z Combine like terms: 9z + -5z = 4z 21 = 4z Solving 21 = 4z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-4z' to each side of the equation. 21 + -4z = 4z + -4z Combine like terms: 4z + -4z = 0 21 + -4z = 0 Add '-21' to each side of the equation. 21 + -21 + -4z = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -4z = 0 + -21 -4z = 0 + -21 Combine like terms: 0 + -21 = -21 -4z = -21 Divide each side by '-4'. z = 5.25 Simplifying z = 5.25
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