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Simplifying -3(4z + 7) = 15 Reorder the terms: -3(7 + 4z) = 15 (7 * -3 + 4z * -3) = 15 (-21 + -12z) = 15 Solving -21 + -12z = 15 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -12z = 15 + 21 Combine like terms: -21 + 21 = 0 0 + -12z = 15 + 21 -12z = 15 + 21 Combine like terms: 15 + 21 = 36 -12z = 36 Divide each side by '-12'. z = -3 Simplifying z = -3
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