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Simplifying 21 + 5b = 2b Solving 21 + 5b = 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 + 5b + -2b = 2b + -2b Combine like terms: 5b + -2b = 3b 21 + 3b = 2b + -2b Combine like terms: 2b + -2b = 0 21 + 3b = 0 Add '-21' to each side of the equation. 21 + -21 + 3b = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 3b = 0 + -21 3b = 0 + -21 Combine like terms: 0 + -21 = -21 3b = -21 Divide each side by '3'. b = -7 Simplifying b = -7
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