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Simplifying b + -8 + 2b = 21 Reorder the terms: -8 + b + 2b = 21 Combine like terms: b + 2b = 3b -8 + 3b = 21 Solving -8 + 3b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 3b = 21 + 8 Combine like terms: -8 + 8 = 0 0 + 3b = 21 + 8 3b = 21 + 8 Combine like terms: 21 + 8 = 29 3b = 29 Divide each side by '3'. b = 9.666666667 Simplifying b = 9.666666667
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