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Simplifying 139 + 21 + 8 + b + 15 = 189 Reorder the terms: 139 + 21 + 8 + 15 + b = 189 Combine like terms: 139 + 21 = 160 160 + 8 + 15 + b = 189 Combine like terms: 160 + 8 = 168 168 + 15 + b = 189 Combine like terms: 168 + 15 = 183 183 + b = 189 Solving 183 + b = 189 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-183' to each side of the equation. 183 + -183 + b = 189 + -183 Combine like terms: 183 + -183 = 0 0 + b = 189 + -183 b = 189 + -183 Combine like terms: 189 + -183 = 6 b = 6 Simplifying b = 6
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