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Simplifying 7.2 = 1z + 3 + -3z Reorder the terms: 7.2 = 3 + 1z + -3z Combine like terms: 1z + -3z = -2z 7.2 = 3 + -2z Solving 7.2 = 3 + -2z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '2z' to each side of the equation. 7.2 + 2z = 3 + -2z + 2z Combine like terms: -2z + 2z = 0 7.2 + 2z = 3 + 0 7.2 + 2z = 3 Add '-7.2' to each side of the equation. 7.2 + -7.2 + 2z = 3 + -7.2 Combine like terms: 7.2 + -7.2 = 0.0 0.0 + 2z = 3 + -7.2 2z = 3 + -7.2 Combine like terms: 3 + -7.2 = -4.2 2z = -4.2 Divide each side by '2'. z = -2.1 Simplifying z = -2.1
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