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Simplifying 9 = -3(z + 7) Reorder the terms: 9 = -3(7 + z) 9 = (7 * -3 + z * -3) 9 = (-21 + -3z) Solving 9 = -21 + -3z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '3z' to each side of the equation. 9 + 3z = -21 + -3z + 3z Combine like terms: -3z + 3z = 0 9 + 3z = -21 + 0 9 + 3z = -21 Add '-9' to each side of the equation. 9 + -9 + 3z = -21 + -9 Combine like terms: 9 + -9 = 0 0 + 3z = -21 + -9 3z = -21 + -9 Combine like terms: -21 + -9 = -30 3z = -30 Divide each side by '3'. z = -10 Simplifying z = -10
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