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Simplifying 5b + 7b + -12 = 21 Reorder the terms: -12 + 5b + 7b = 21 Combine like terms: 5b + 7b = 12b -12 + 12b = 21 Solving -12 + 12b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 12b = 21 + 12 Combine like terms: -12 + 12 = 0 0 + 12b = 21 + 12 12b = 21 + 12 Combine like terms: 21 + 12 = 33 12b = 33 Divide each side by '12'. b = 2.75 Simplifying b = 2.75
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