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Simplifying 21 = 101 + -2b Solving 21 = 101 + -2b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2b' to each side of the equation. 21 + 2b = 101 + -2b + 2b Combine like terms: -2b + 2b = 0 21 + 2b = 101 + 0 21 + 2b = 101 Add '-21' to each side of the equation. 21 + -21 + 2b = 101 + -21 Combine like terms: 21 + -21 = 0 0 + 2b = 101 + -21 2b = 101 + -21 Combine like terms: 101 + -21 = 80 2b = 80 Divide each side by '2'. b = 40 Simplifying b = 40
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