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Simplifying 13b + 15 + -9 = 90 Reorder the terms: 15 + -9 + 13b = 90 Combine like terms: 15 + -9 = 6 6 + 13b = 90 Solving 6 + 13b = 90 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 13b = 90 + -6 Combine like terms: 6 + -6 = 0 0 + 13b = 90 + -6 13b = 90 + -6 Combine like terms: 90 + -6 = 84 13b = 84 Divide each side by '13'. b = 6.461538462 Simplifying b = 6.461538462
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