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Simplifying 42 = 18 + b + 20 Reorder the terms: 42 = 18 + 20 + b Combine like terms: 18 + 20 = 38 42 = 38 + b Solving 42 = 38 + b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1b' to each side of the equation. 42 + -1b = 38 + b + -1b Combine like terms: b + -1b = 0 42 + -1b = 38 + 0 42 + -1b = 38 Add '-42' to each side of the equation. 42 + -42 + -1b = 38 + -42 Combine like terms: 42 + -42 = 0 0 + -1b = 38 + -42 -1b = 38 + -42 Combine like terms: 38 + -42 = -4 -1b = -4 Divide each side by '-1'. b = 4 Simplifying b = 4
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