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Simplifying 7z + -15 = -15 + 4z Reorder the terms: -15 + 7z = -15 + 4z Add '15' to each side of the equation. -15 + 15 + 7z = -15 + 15 + 4z Combine like terms: -15 + 15 = 0 0 + 7z = -15 + 15 + 4z 7z = -15 + 15 + 4z Combine like terms: -15 + 15 = 0 7z = 0 + 4z 7z = 4z Solving 7z = 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. 7z + -4z = 4z + -4z Combine like terms: 7z + -4z = 3z 3z = 4z + -4z Combine like terms: 4z + -4z = 0 3z = 0 Divide each side by '3'. z = 0 Simplifying z = 0
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