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Simplifying -1(z + 9) + (2z + 1) = -4(z + 1) Reorder the terms: -1(9 + z) + (2z + 1) = -4(z + 1) (9 * -1 + z * -1) + (2z + 1) = -4(z + 1) (-9 + -1z) + (2z + 1) = -4(z + 1) Reorder the terms: -9 + -1z + (1 + 2z) = -4(z + 1) Remove parenthesis around (1 + 2z) -9 + -1z + 1 + 2z = -4(z + 1) Reorder the terms: -9 + 1 + -1z + 2z = -4(z + 1) Combine like terms: -9 + 1 = -8 -8 + -1z + 2z = -4(z + 1) Combine like terms: -1z + 2z = 1z -8 + 1z = -4(z + 1) Reorder the terms: -8 + 1z = -4(1 + z) -8 + 1z = (1 * -4 + z * -4) -8 + 1z = (-4 + -4z) Solving -8 + 1z = -4 + -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. -8 + 1z + 4z = -4 + -4z + 4z Combine like terms: 1z + 4z = 5z -8 + 5z = -4 + -4z + 4z Combine like terms: -4z + 4z = 0 -8 + 5z = -4 + 0 -8 + 5z = -4 Add '8' to each side of the equation. -8 + 8 + 5z = -4 + 8 Combine like terms: -8 + 8 = 0 0 + 5z = -4 + 8 5z = -4 + 8 Combine like terms: -4 + 8 = 4 5z = 4 Divide each side by '5'. z = 0.8 Simplifying z = 0.8
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