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Simplifying -21 = -1 + -1b Solving -21 = -1 + -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 + b = -1 + -1b + b Combine like terms: -1b + b = 0 -21 + b = -1 + 0 -21 + b = -1 Add '21' to each side of the equation. -21 + 21 + b = -1 + 21 Combine like terms: -21 + 21 = 0 0 + b = -1 + 21 b = -1 + 21 Combine like terms: -1 + 21 = 20 b = 20 Simplifying b = 20
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