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Simplifying 6 + 15 = 4z + 20 Combine like terms: 6 + 15 = 21 21 = 4z + 20 Reorder the terms: 21 = 20 + 4z Solving 21 = 20 + 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 = 20 + 4z + -4z Combine like terms: 4z + -4z = 0 21 + -4z = 20 + 0 21 + -4z = 20 Add '-21' to each side of the equation. 21 + -21 + -4z = 20 + -21 Combine like terms: 21 + -21 = 0 0 + -4z = 20 + -21 -4z = 20 + -21 Combine like terms: 20 + -21 = -1 -4z = -1 Divide each side by '-4'. z = 0.25 Simplifying z = 0.25
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