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Simplifying -18 = -3(3 + 3z) -18 = (3 * -3 + 3z * -3) -18 = (-9 + -9z) Solving -18 = -9 + -9z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '9z' to each side of the equation. -18 + 9z = -9 + -9z + 9z Combine like terms: -9z + 9z = 0 -18 + 9z = -9 + 0 -18 + 9z = -9 Add '18' to each side of the equation. -18 + 18 + 9z = -9 + 18 Combine like terms: -18 + 18 = 0 0 + 9z = -9 + 18 9z = -9 + 18 Combine like terms: -9 + 18 = 9 9z = 9 Divide each side by '9'. z = 1 Simplifying z = 1
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