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Simplifying 31 + -5b + 9 + 12b + -19 = 72 Reorder the terms: 31 + 9 + -19 + -5b + 12b = 72 Combine like terms: 31 + 9 = 40 40 + -19 + -5b + 12b = 72 Combine like terms: 40 + -19 = 21 21 + -5b + 12b = 72 Combine like terms: -5b + 12b = 7b 21 + 7b = 72 Solving 21 + 7b = 72 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 + 7b = 72 + -21 Combine like terms: 21 + -21 = 0 0 + 7b = 72 + -21 7b = 72 + -21 Combine like terms: 72 + -21 = 51 7b = 51 Divide each side by '7'. b = 7.285714286 Simplifying b = 7.285714286
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