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Simplifying b + -7 + 2b = 21 Reorder the terms: -7 + b + 2b = 21 Combine like terms: b + 2b = 3b -7 + 3b = 21 Solving -7 + 3b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 3b = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 3b = 21 + 7 3b = 21 + 7 Combine like terms: 21 + 7 = 28 3b = 28 Divide each side by '3'. b = 9.333333333 Simplifying b = 9.333333333
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