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Simplifying 21b + 9 + -15b = 3 Reorder the terms: 9 + 21b + -15b = 3 Combine like terms: 21b + -15b = 6b 9 + 6b = 3 Solving 9 + 6b = 3 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 6b = 3 + -9 Combine like terms: 9 + -9 = 0 0 + 6b = 3 + -9 6b = 3 + -9 Combine like terms: 3 + -9 = -6 6b = -6 Divide each side by '6'. b = -1 Simplifying b = -1
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