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Simplifying 12b + 21 = -2b + -21 Reorder the terms: 21 + 12b = -2b + -21 Reorder the terms: 21 + 12b = -21 + -2b Solving 21 + 12b = -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 + 12b + 2b = -21 + -2b + 2b Combine like terms: 12b + 2b = 14b 21 + 14b = -21 + -2b + 2b Combine like terms: -2b + 2b = 0 21 + 14b = -21 + 0 21 + 14b = -21 Add '-21' to each side of the equation. 21 + -21 + 14b = -21 + -21 Combine like terms: 21 + -21 = 0 0 + 14b = -21 + -21 14b = -21 + -21 Combine like terms: -21 + -21 = -42 14b = -42 Divide each side by '14'. b = -3 Simplifying b = -3
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