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Simplifying 2b + 13 = 21 Reorder the terms: 13 + 2b = 21 Solving 13 + 2b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 2b = 21 + -13 Combine like terms: 13 + -13 = 0 0 + 2b = 21 + -13 2b = 21 + -13 Combine like terms: 21 + -13 = 8 2b = 8 Divide each side by '2'. b = 4 Simplifying b = 4
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