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Simplifying 21b + 9 = 15b + 13 Reorder the terms: 9 + 21b = 15b + 13 Reorder the terms: 9 + 21b = 13 + 15b Solving 9 + 21b = 13 + 15b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-15b' to each side of the equation. 9 + 21b + -15b = 13 + 15b + -15b Combine like terms: 21b + -15b = 6b 9 + 6b = 13 + 15b + -15b Combine like terms: 15b + -15b = 0 9 + 6b = 13 + 0 9 + 6b = 13 Add '-9' to each side of the equation. 9 + -9 + 6b = 13 + -9 Combine like terms: 9 + -9 = 0 0 + 6b = 13 + -9 6b = 13 + -9 Combine like terms: 13 + -9 = 4 6b = 4 Divide each side by '6'. b = 0.6666666667 Simplifying b = 0.6666666667
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