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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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