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Simplifying -21 = b + -1 Reorder the terms: -21 = -1 + b Solving -21 = -1 + b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1b' to each side of the equation. -21 + -1b = -1 + b + -1b Combine like terms: b + -1b = 0 -21 + -1b = -1 + 0 -21 + -1b = -1 Add '21' to each side of the equation. -21 + 21 + -1b = -1 + 21 Combine like terms: -21 + 21 = 0 0 + -1b = -1 + 21 -1b = -1 + 21 Combine like terms: -1 + 21 = 20 -1b = 20 Divide each side by '-1'. b = -20 Simplifying b = -20
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