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Simplifying 15 + -1(4z + 3) = 12 Reorder the terms: 15 + -1(3 + 4z) = 12 15 + (3 * -1 + 4z * -1) = 12 15 + (-3 + -4z) = 12 Combine like terms: 15 + -3 = 12 12 + -4z = 12 Add '-12' to each side of the equation. 12 + -12 + -4z = 12 + -12 Combine like terms: 12 + -12 = 0 0 + -4z = 12 + -12 -4z = 12 + -12 Combine like terms: 12 + -12 = 0 -4z = 0 Solving -4z = 0 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Divide each side by '-4'. z = 0 Simplifying z = 0
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