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Simplifying 70 = -7(-1 + -2z) 70 = (-1 * -7 + -2z * -7) 70 = (7 + 14z) Solving 70 = 7 + 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 = 7 + 14z + -14z Combine like terms: 14z + -14z = 0 70 + -14z = 7 + 0 70 + -14z = 7 Add '-70' to each side of the equation. 70 + -70 + -14z = 7 + -70 Combine like terms: 70 + -70 = 0 0 + -14z = 7 + -70 -14z = 7 + -70 Combine like terms: 7 + -70 = -63 -14z = -63 Divide each side by '-14'. z = 4.5 Simplifying z = 4.5
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