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Simplifying (5w + -15) * 21 = 0 Reorder the terms: (-15 + 5w) * 21 = 0 Reorder the terms for easier multiplication: 21(-15 + 5w) = 0 (-15 * 21 + 5w * 21) = 0 (-315 + 105w) = 0 Solving -315 + 105w = 0 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '315' to each side of the equation. -315 + 315 + 105w = 0 + 315 Combine like terms: -315 + 315 = 0 0 + 105w = 0 + 315 105w = 0 + 315 Combine like terms: 0 + 315 = 315 105w = 315 Divide each side by '105'. w = 3 Simplifying w = 3
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