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Simplifying 8z + 13z + -20z + -4z = 11z Combine like terms: 8z + 13z = 21z 21z + -20z + -4z = 11z Combine like terms: 21z + -20z = 1z 1z + -4z = 11z Combine like terms: 1z + -4z = -3z -3z = 11z Solving -3z = 11z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-11z' to each side of the equation. -3z + -11z = 11z + -11z Combine like terms: -3z + -11z = -14z -14z = 11z + -11z Combine like terms: 11z + -11z = 0 -14z = 0 Divide each side by '-14'. z = 0 Simplifying z = 0
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