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Simplifying 4.2 + 7z = 2.5 Solving 4.2 + 7z = 2.5 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-4.2' to each side of the equation. 4.2 + -4.2 + 7z = 2.5 + -4.2 Combine like terms: 4.2 + -4.2 = 0.0 0.0 + 7z = 2.5 + -4.2 7z = 2.5 + -4.2 Combine like terms: 2.5 + -4.2 = -1.7 7z = -1.7 Divide each side by '7'. z = -0.2428571429 Simplifying z = -0.2428571429
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