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Simplifying 4z + -1(7 + 3z) = 5 4z + (7 * -1 + 3z * -1) = 5 4z + (-7 + -3z) = 5 Reorder the terms: -7 + 4z + -3z = 5 Combine like terms: 4z + -3z = 1z -7 + 1z = 5 Solving -7 + 1z = 5 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 1z = 5 + 7 Combine like terms: -7 + 7 = 0 0 + 1z = 5 + 7 1z = 5 + 7 Combine like terms: 5 + 7 = 12 1z = 12 Divide each side by '1'. z = 12 Simplifying z = 12
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