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Simplifying 1 + -1b = -21 + b Solving 1 + -1b = -21 + 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. 1 + -1b + -1b = -21 + b + -1b Combine like terms: -1b + -1b = -2b 1 + -2b = -21 + b + -1b Combine like terms: b + -1b = 0 1 + -2b = -21 + 0 1 + -2b = -21 Add '-1' to each side of the equation. 1 + -1 + -2b = -21 + -1 Combine like terms: 1 + -1 = 0 0 + -2b = -21 + -1 -2b = -21 + -1 Combine like terms: -21 + -1 = -22 -2b = -22 Divide each side by '-2'. b = 11 Simplifying b = 11
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