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Simplifying 12 = -2(-2 + -2z) 12 = (-2 * -2 + -2z * -2) 12 = (4 + 4z) Solving 12 = 4 + 4z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-4z' to each side of the equation. 12 + -4z = 4 + 4z + -4z Combine like terms: 4z + -4z = 0 12 + -4z = 4 + 0 12 + -4z = 4 Add '-12' to each side of the equation. 12 + -12 + -4z = 4 + -12 Combine like terms: 12 + -12 = 0 0 + -4z = 4 + -12 -4z = 4 + -12 Combine like terms: 4 + -12 = -8 -4z = -8 Divide each side by '-4'. z = 2 Simplifying z = 2
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