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Simplifying -7 = 9 + -2z Solving -7 = 9 + -2z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '2z' to each side of the equation. -7 + 2z = 9 + -2z + 2z Combine like terms: -2z + 2z = 0 -7 + 2z = 9 + 0 -7 + 2z = 9 Add '7' to each side of the equation. -7 + 7 + 2z = 9 + 7 Combine like terms: -7 + 7 = 0 0 + 2z = 9 + 7 2z = 9 + 7 Combine like terms: 9 + 7 = 16 2z = 16 Divide each side by '2'. z = 8 Simplifying z = 8
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