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Simplifying 21 = 2b Solving 21 = 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 = 2b + -2b Combine like terms: 2b + -2b = 0 21 + -2b = 0 Add '-21' to each side of the equation. 21 + -21 + -2b = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -2b = 0 + -21 -2b = 0 + -21 Combine like terms: 0 + -21 = -21 -2b = -21 Divide each side by '-2'. b = 10.5 Simplifying b = 10.5
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