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Simplifying 15 + 4z = 15 Add '-15' to each side of the equation. 15 + -15 + 4z = 15 + -15 Combine like terms: 15 + -15 = 0 0 + 4z = 15 + -15 4z = 15 + -15 Combine like terms: 15 + -15 = 0 4z = 0 Solving 4z = 0 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Divide each side by '4'. z = 0 Simplifying z = 0
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