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Simplifying 2b + 3b + -6 = 21 Reorder the terms: -6 + 2b + 3b = 21 Combine like terms: 2b + 3b = 5b -6 + 5b = 21 Solving -6 + 5b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 5b = 21 + 6 Combine like terms: -6 + 6 = 0 0 + 5b = 21 + 6 5b = 21 + 6 Combine like terms: 21 + 6 = 27 5b = 27 Divide each side by '5'. b = 5.4 Simplifying b = 5.4
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