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Simplifying 21b + -9 + 2b + -1b = -87 Reorder the terms: -9 + 21b + 2b + -1b = -87 Combine like terms: 21b + 2b = 23b -9 + 23b + -1b = -87 Combine like terms: 23b + -1b = 22b -9 + 22b = -87 Solving -9 + 22b = -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 + 22b = -87 + 9 Combine like terms: -9 + 9 = 0 0 + 22b = -87 + 9 22b = -87 + 9 Combine like terms: -87 + 9 = -78 22b = -78 Divide each side by '22'. b = -3.545454545 Simplifying b = -3.545454545
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