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Simplifying 9 = b(21) Reorder the terms for easier multiplication: 9 = 21b Solving 9 = 21b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-21b' to each side of the equation. 9 + -21b = 21b + -21b Combine like terms: 21b + -21b = 0 9 + -21b = 0 Add '-9' to each side of the equation. 9 + -9 + -21b = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -21b = 0 + -9 -21b = 0 + -9 Combine like terms: 0 + -9 = -9 -21b = -9 Divide each side by '-21'. b = 0.4285714286 Simplifying b = 0.4285714286
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