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Simplifying -2z + -1z + 12 = 78 Reorder the terms: 12 + -2z + -1z = 78 Combine like terms: -2z + -1z = -3z 12 + -3z = 78 Solving 12 + -3z = 78 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -3z = 78 + -12 Combine like terms: 12 + -12 = 0 0 + -3z = 78 + -12 -3z = 78 + -12 Combine like terms: 78 + -12 = 66 -3z = 66 Divide each side by '-3'. z = -22 Simplifying z = -22
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