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Simplifying 2z + 3 + 7z = -12 Reorder the terms: 3 + 2z + 7z = -12 Combine like terms: 2z + 7z = 9z 3 + 9z = -12 Solving 3 + 9z = -12 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 9z = -12 + -3 Combine like terms: 3 + -3 = 0 0 + 9z = -12 + -3 9z = -12 + -3 Combine like terms: -12 + -3 = -15 9z = -15 Divide each side by '9'. z = -1.666666667 Simplifying z = -1.666666667
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