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Simplifying 7z + -140 = 5z Reorder the terms: -140 + 7z = 5z Solving -140 + 7z = 5z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-5z' to each side of the equation. -140 + 7z + -5z = 5z + -5z Combine like terms: 7z + -5z = 2z -140 + 2z = 5z + -5z Combine like terms: 5z + -5z = 0 -140 + 2z = 0 Add '140' to each side of the equation. -140 + 140 + 2z = 0 + 140 Combine like terms: -140 + 140 = 0 0 + 2z = 0 + 140 2z = 0 + 140 Combine like terms: 0 + 140 = 140 2z = 140 Divide each side by '2'. z = 70 Simplifying z = 70
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