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Simplifying 2z2 + -8z + -1z = 2z2 + 4 Reorder the terms: -8z + -1z + 2z2 = 2z2 + 4 Combine like terms: -8z + -1z = -9z -9z + 2z2 = 2z2 + 4 Reorder the terms: -9z + 2z2 = 4 + 2z2 Add '-2z2' to each side of the equation. -9z + 2z2 + -2z2 = 4 + 2z2 + -2z2 Combine like terms: 2z2 + -2z2 = 0 -9z + 0 = 4 + 2z2 + -2z2 -9z = 4 + 2z2 + -2z2 Combine like terms: 2z2 + -2z2 = 0 -9z = 4 + 0 -9z = 4 Solving -9z = 4 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Divide each side by '-9'. z = -0.4444444444 Simplifying z = -0.4444444444
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