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Simplifying 21 = 2w + -15 Reorder the terms: 21 = -15 + 2w Solving 21 = -15 + 2w Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-2w' to each side of the equation. 21 + -2w = -15 + 2w + -2w Combine like terms: 2w + -2w = 0 21 + -2w = -15 + 0 21 + -2w = -15 Add '-21' to each side of the equation. 21 + -21 + -2w = -15 + -21 Combine like terms: 21 + -21 = 0 0 + -2w = -15 + -21 -2w = -15 + -21 Combine like terms: -15 + -21 = -36 -2w = -36 Divide each side by '-2'. w = 18 Simplifying w = 18
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