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Simplifying 4(2z + 9) = 18 + -2(z + -9) Reorder the terms: 4(9 + 2z) = 18 + -2(z + -9) (9 * 4 + 2z * 4) = 18 + -2(z + -9) (36 + 8z) = 18 + -2(z + -9) Reorder the terms: 36 + 8z = 18 + -2(-9 + z) 36 + 8z = 18 + (-9 * -2 + z * -2) 36 + 8z = 18 + (18 + -2z) Combine like terms: 18 + 18 = 36 36 + 8z = 36 + -2z Add '-36' to each side of the equation. 36 + -36 + 8z = 36 + -36 + -2z Combine like terms: 36 + -36 = 0 0 + 8z = 36 + -36 + -2z 8z = 36 + -36 + -2z Combine like terms: 36 + -36 = 0 8z = 0 + -2z 8z = -2z Solving 8z = -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. 8z + 2z = -2z + 2z Combine like terms: 8z + 2z = 10z 10z = -2z + 2z Combine like terms: -2z + 2z = 0 10z = 0 Divide each side by '10'. z = 0.0 Simplifying z = 0.0
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