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Simplifying 12 + -21 = -1z Combine like terms: 12 + -21 = -9 -9 = -1z Solving -9 = -1z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add 'z' to each side of the equation. -9 + z = -1z + z Combine like terms: -1z + z = 0 -9 + z = 0 Add '9' to each side of the equation. -9 + 9 + z = 0 + 9 Combine like terms: -9 + 9 = 0 0 + z = 0 + 9 z = 0 + 9 Combine like terms: 0 + 9 = 9 z = 9 Simplifying z = 9
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