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Simplifying 9 + -2z = 30 + z Solving 9 + -2z = 30 + z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1z' to each side of the equation. 9 + -2z + -1z = 30 + z + -1z Combine like terms: -2z + -1z = -3z 9 + -3z = 30 + z + -1z Combine like terms: z + -1z = 0 9 + -3z = 30 + 0 9 + -3z = 30 Add '-9' to each side of the equation. 9 + -9 + -3z = 30 + -9 Combine like terms: 9 + -9 = 0 0 + -3z = 30 + -9 -3z = 30 + -9 Combine like terms: 30 + -9 = 21 -3z = 21 Divide each side by '-3'. z = -7 Simplifying z = -7
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