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Simplifying 2b + -21 = 6 + -1b Reorder the terms: -21 + 2b = 6 + -1b Solving -21 + 2b = 6 + -1b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add 'b' to each side of the equation. -21 + 2b + b = 6 + -1b + b Combine like terms: 2b + b = 3b -21 + 3b = 6 + -1b + b Combine like terms: -1b + b = 0 -21 + 3b = 6 + 0 -21 + 3b = 6 Add '21' to each side of the equation. -21 + 21 + 3b = 6 + 21 Combine like terms: -21 + 21 = 0 0 + 3b = 6 + 21 3b = 6 + 21 Combine like terms: 6 + 21 = 27 3b = 27 Divide each side by '3'. b = 9 Simplifying b = 9
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