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Simplifying 28 = 7 + 2(z + 9) Reorder the terms: 28 = 7 + 2(9 + z) 28 = 7 + (9 * 2 + z * 2) 28 = 7 + (18 + 2z) Combine like terms: 7 + 18 = 25 28 = 25 + 2z Solving 28 = 25 + 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. 28 + -2z = 25 + 2z + -2z Combine like terms: 2z + -2z = 0 28 + -2z = 25 + 0 28 + -2z = 25 Add '-28' to each side of the equation. 28 + -28 + -2z = 25 + -28 Combine like terms: 28 + -28 = 0 0 + -2z = 25 + -28 -2z = 25 + -28 Combine like terms: 25 + -28 = -3 -2z = -3 Divide each side by '-2'. z = 1.5 Simplifying z = 1.5
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