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Simplifying 70 = -7(2 + -2z) 70 = (2 * -7 + -2z * -7) 70 = (-14 + 14z) Solving 70 = -14 + 14z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-14z' to each side of the equation. 70 + -14z = -14 + 14z + -14z Combine like terms: 14z + -14z = 0 70 + -14z = -14 + 0 70 + -14z = -14 Add '-70' to each side of the equation. 70 + -70 + -14z = -14 + -70 Combine like terms: 70 + -70 = 0 0 + -14z = -14 + -70 -14z = -14 + -70 Combine like terms: -14 + -70 = -84 -14z = -84 Divide each side by '-14'. z = 6 Simplifying z = 6
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