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Simplifying b + -4 + 2b = 21 Reorder the terms: -4 + b + 2b = 21 Combine like terms: b + 2b = 3b -4 + 3b = 21 Solving -4 + 3b = 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 + 3b = 21 + 4 Combine like terms: -4 + 4 = 0 0 + 3b = 21 + 4 3b = 21 + 4 Combine like terms: 21 + 4 = 25 3b = 25 Divide each side by '3'. b = 8.333333333 Simplifying b = 8.333333333
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