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Simplifying z + 9 = 2(z) Reorder the terms: 9 + z = 2(z) Solving 9 + z = 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. 9 + z + -2z = 2z + -2z Combine like terms: z + -2z = -1z 9 + -1z = 2z + -2z Combine like terms: 2z + -2z = 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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