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Simplifying 2b + 7(3 + 3b) = 159 2b + (3 * 7 + 3b * 7) = 159 2b + (21 + 21b) = 159 Reorder the terms: 21 + 2b + 21b = 159 Combine like terms: 2b + 21b = 23b 21 + 23b = 159 Solving 21 + 23b = 159 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 23b = 159 + -21 Combine like terms: 21 + -21 = 0 0 + 23b = 159 + -21 23b = 159 + -21 Combine like terms: 159 + -21 = 138 23b = 138 Divide each side by '23'. b = 6 Simplifying b = 6
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