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Simplifying 12b + -9 + 2b + -1b = -87 Reorder the terms: -9 + 12b + 2b + -1b = -87 Combine like terms: 12b + 2b = 14b -9 + 14b + -1b = -87 Combine like terms: 14b + -1b = 13b -9 + 13b = -87 Solving -9 + 13b = -87 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 + 13b = -87 + 9 Combine like terms: -9 + 9 = 0 0 + 13b = -87 + 9 13b = -87 + 9 Combine like terms: -87 + 9 = -78 13b = -78 Divide each side by '13'. b = -6 Simplifying b = -6
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