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Simplifying 13 = 21 + -1w Solving 13 = 21 + -1w Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add 'w' to each side of the equation. 13 + w = 21 + -1w + w Combine like terms: -1w + w = 0 13 + w = 21 + 0 13 + w = 21 Add '-13' to each side of the equation. 13 + -13 + w = 21 + -13 Combine like terms: 13 + -13 = 0 0 + w = 21 + -13 w = 21 + -13 Combine like terms: 21 + -13 = 8 w = 8 Simplifying w = 8
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