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Simplifying -3b + 21 = -9 Reorder the terms: 21 + -3b = -9 Solving 21 + -3b = -9 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -3b = -9 + -21 Combine like terms: 21 + -21 = 0 0 + -3b = -9 + -21 -3b = -9 + -21 Combine like terms: -9 + -21 = -30 -3b = -30 Divide each side by '-3'. b = 10 Simplifying b = 10
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