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Simplifying 21 = 3(4 + -2b) 21 = (4 * 3 + -2b * 3) 21 = (12 + -6b) Solving 21 = 12 + -6b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '6b' to each side of the equation. 21 + 6b = 12 + -6b + 6b Combine like terms: -6b + 6b = 0 21 + 6b = 12 + 0 21 + 6b = 12 Add '-21' to each side of the equation. 21 + -21 + 6b = 12 + -21 Combine like terms: 21 + -21 = 0 0 + 6b = 12 + -21 6b = 12 + -21 Combine like terms: 12 + -21 = -9 6b = -9 Divide each side by '6'. b = -1.5 Simplifying b = -1.5
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