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Simplifying 21 = 3s + -4b Reorder the terms: 21 = -4b + 3s Solving 21 = -4b + 3s Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4b' to each side of the equation. 21 + 4b = -4b + 4b + 3s Combine like terms: -4b + 4b = 0 21 + 4b = 0 + 3s 21 + 4b = 3s Add '-21' to each side of the equation. 21 + -21 + 4b = -21 + 3s Combine like terms: 21 + -21 = 0 0 + 4b = -21 + 3s 4b = -21 + 3s Divide each side by '4'. b = -5.25 + 0.75s Simplifying b = -5.25 + 0.75s
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