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Simplifying -3(5 + -7z) = -26 (5 * -3 + -7z * -3) = -26 (-15 + 21z) = -26 Solving -15 + 21z = -26 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 21z = -26 + 15 Combine like terms: -15 + 15 = 0 0 + 21z = -26 + 15 21z = -26 + 15 Combine like terms: -26 + 15 = -11 21z = -11 Divide each side by '21'. z = -0.5238095238 Simplifying z = -0.5238095238
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