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Simplifying 21 = 4z + -3 Reorder the terms: 21 = -3 + 4z Solving 21 = -3 + 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 = -3 + 4z + -4z Combine like terms: 4z + -4z = 0 21 + -4z = -3 + 0 21 + -4z = -3 Add '-21' to each side of the equation. 21 + -21 + -4z = -3 + -21 Combine like terms: 21 + -21 = 0 0 + -4z = -3 + -21 -4z = -3 + -21 Combine like terms: -3 + -21 = -24 -4z = -24 Divide each side by '-4'. z = 6 Simplifying z = 6
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