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Simplifying 10 + b + b + 2(10 + b) = 130 10 + b + b + (10 * 2 + b * 2) = 130 10 + b + b + (20 + 2b) = 130 Reorder the terms: 10 + 20 + b + b + 2b = 130 Combine like terms: 10 + 20 = 30 30 + b + b + 2b = 130 Combine like terms: b + b = 2b 30 + 2b + 2b = 130 Combine like terms: 2b + 2b = 4b 30 + 4b = 130 Solving 30 + 4b = 130 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 4b = 130 + -30 Combine like terms: 30 + -30 = 0 0 + 4b = 130 + -30 4b = 130 + -30 Combine like terms: 130 + -30 = 100 4b = 100 Divide each side by '4'. b = 25 Simplifying b = 25
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