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Simplifying 42 + b + 48 + 90 = 180 Reorder the terms: 42 + 48 + 90 + b = 180 Combine like terms: 42 + 48 = 90 90 + 90 + b = 180 Combine like terms: 90 + 90 = 180 180 + b = 180 Add '-180' to each side of the equation. 180 + -180 + b = 180 + -180 Combine like terms: 180 + -180 = 0 0 + b = 180 + -180 b = 180 + -180 Combine like terms: 180 + -180 = 0 b = 0 Solving b = 0 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Simplifying b = 0
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