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Simplifying 3b + b + 4 = 21 Reorder the terms: 4 + 3b + b = 21 Combine like terms: 3b + b = 4b 4 + 4b = 21 Solving 4 + 4b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 4b = 21 + -4 Combine like terms: 4 + -4 = 0 0 + 4b = 21 + -4 4b = 21 + -4 Combine like terms: 21 + -4 = 17 4b = 17 Divide each side by '4'. b = 4.25 Simplifying b = 4.25
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