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Simplifying 144 + z = 120 + 9z Solving 144 + z = 120 + 9z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-9z' to each side of the equation. 144 + z + -9z = 120 + 9z + -9z Combine like terms: z + -9z = -8z 144 + -8z = 120 + 9z + -9z Combine like terms: 9z + -9z = 0 144 + -8z = 120 + 0 144 + -8z = 120 Add '-144' to each side of the equation. 144 + -144 + -8z = 120 + -144 Combine like terms: 144 + -144 = 0 0 + -8z = 120 + -144 -8z = 120 + -144 Combine like terms: 120 + -144 = -24 -8z = -24 Divide each side by '-8'. z = 3 Simplifying z = 3
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