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Simplifying 13z + -9 = 12z Reorder the terms: -9 + 13z = 12z Solving -9 + 13z = 12z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-12z' to each side of the equation. -9 + 13z + -12z = 12z + -12z Combine like terms: 13z + -12z = 1z -9 + 1z = 12z + -12z Combine like terms: 12z + -12z = 0 -9 + 1z = 0 Add '9' to each side of the equation. -9 + 9 + 1z = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 1z = 0 + 9 1z = 0 + 9 Combine like terms: 0 + 9 = 9 1z = 9 Divide each side by '1'. z = 9 Simplifying z = 9
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