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Simplifying (3z + 4)(3z + 4) + -1(3z + -8)(3z + 8) = 4z Reorder the terms: (4 + 3z)(3z + 4) + -1(3z + -8)(3z + 8) = 4z Reorder the terms: (4 + 3z)(4 + 3z) + -1(3z + -8)(3z + 8) = 4z Multiply (4 + 3z) * (4 + 3z) (4(4 + 3z) + 3z * (4 + 3z)) + -1(3z + -8)(3z + 8) = 4z ((4 * 4 + 3z * 4) + 3z * (4 + 3z)) + -1(3z + -8)(3z + 8) = 4z ((16 + 12z) + 3z * (4 + 3z)) + -1(3z + -8)(3z + 8) = 4z (16 + 12z + (4 * 3z + 3z * 3z)) + -1(3z + -8)(3z + 8) = 4z (16 + 12z + (12z + 9z2)) + -1(3z + -8)(3z + 8) = 4z Combine like terms: 12z + 12z = 24z (16 + 24z + 9z2) + -1(3z + -8)(3z + 8) = 4z Reorder the terms: 16 + 24z + 9z2 + -1(-8 + 3z)(3z + 8) = 4z Reorder the terms: 16 + 24z + 9z2 + -1(-8 + 3z)(8 + 3z) = 4z Multiply (-8 + 3z) * (8 + 3z) 16 + 24z + 9z2 + -1(-8(8 + 3z) + 3z * (8 + 3z)) = 4z 16 + 24z + 9z2 + -1((8 * -8 + 3z * -8) + 3z * (8 + 3z)) = 4z 16 + 24z + 9z2 + -1((-64 + -24z) + 3z * (8 + 3z)) = 4z 16 + 24z + 9z2 + -1(-64 + -24z + (8 * 3z + 3z * 3z)) = 4z 16 + 24z + 9z2 + -1(-64 + -24z + (24z + 9z2)) = 4z Combine like terms: -24z + 24z = 0 16 + 24z + 9z2 + -1(-64 + 0 + 9z2) = 4z 16 + 24z + 9z2 + -1(-64 + 9z2) = 4z 16 + 24z + 9z2 + (-64 * -1 + 9z2 * -1) = 4z 16 + 24z + 9z2 + (64 + -9z2) = 4z Reorder the terms: 16 + 64 + 24z + 9z2 + -9z2 = 4z Combine like terms: 16 + 64 = 80 80 + 24z + 9z2 + -9z2 = 4z Combine like terms: 9z2 + -9z2 = 0 80 + 24z + 0 = 4z 80 + 24z = 4z Solving 80 + 24z = 4z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-4z' to each side of the equation. 80 + 24z + -4z = 4z + -4z Combine like terms: 24z + -4z = 20z 80 + 20z = 4z + -4z Combine like terms: 4z + -4z = 0 80 + 20z = 0 Add '-80' to each side of the equation. 80 + -80 + 20z = 0 + -80 Combine like terms: 80 + -80 = 0 0 + 20z = 0 + -80 20z = 0 + -80 Combine like terms: 0 + -80 = -80 20z = -80 Divide each side by '20'. z = -4 Simplifying z = -4
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