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Simplifying 558 = -31(z + 691) Reorder the terms: 558 = -31(691 + z) 558 = (691 * -31 + z * -31) 558 = (-21421 + -31z) Solving 558 = -21421 + -31z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '31z' to each side of the equation. 558 + 31z = -21421 + -31z + 31z Combine like terms: -31z + 31z = 0 558 + 31z = -21421 + 0 558 + 31z = -21421 Add '-558' to each side of the equation. 558 + -558 + 31z = -21421 + -558 Combine like terms: 558 + -558 = 0 0 + 31z = -21421 + -558 31z = -21421 + -558 Combine like terms: -21421 + -558 = -21979 31z = -21979 Divide each side by '31'. z = -709 Simplifying z = -709
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