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Simplifying -21z = -18 + -1(-27z + -15) Reorder the terms: -21z = -18 + -1(-15 + -27z) -21z = -18 + (-15 * -1 + -27z * -1) -21z = -18 + (15 + 27z) Combine like terms: -18 + 15 = -3 -21z = -3 + 27z Solving -21z = -3 + 27z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-27z' to each side of the equation. -21z + -27z = -3 + 27z + -27z Combine like terms: -21z + -27z = -48z -48z = -3 + 27z + -27z Combine like terms: 27z + -27z = 0 -48z = -3 + 0 -48z = -3 Divide each side by '-48'. z = 0.0625 Simplifying z = 0.0625
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