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Simplifying 3b + -9 + -8b = 21 Reorder the terms: -9 + 3b + -8b = 21 Combine like terms: 3b + -8b = -5b -9 + -5b = 21 Solving -9 + -5b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -5b = 21 + 9 Combine like terms: -9 + 9 = 0 0 + -5b = 21 + 9 -5b = 21 + 9 Combine like terms: 21 + 9 = 30 -5b = 30 Divide each side by '-5'. b = -6 Simplifying b = -6
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