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Simplifying 7b + -3 + 5b = 21 Reorder the terms: -3 + 7b + 5b = 21 Combine like terms: 7b + 5b = 12b -3 + 12b = 21 Solving -3 + 12b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 12b = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 12b = 21 + 3 12b = 21 + 3 Combine like terms: 21 + 3 = 24 12b = 24 Divide each side by '12'. b = 2 Simplifying b = 2
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