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Simplifying b + -4 + 8b = 21 Reorder the terms: -4 + b + 8b = 21 Combine like terms: b + 8b = 9b -4 + 9b = 21 Solving -4 + 9b = 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 + 9b = 21 + 4 Combine like terms: -4 + 4 = 0 0 + 9b = 21 + 4 9b = 21 + 4 Combine like terms: 21 + 4 = 25 9b = 25 Divide each side by '9'. b = 2.777777778 Simplifying b = 2.777777778
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