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Simplifying 13 = 20 + -1b Solving 13 = 20 + -1b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add 'b' to each side of the equation. 13 + b = 20 + -1b + b Combine like terms: -1b + b = 0 13 + b = 20 + 0 13 + b = 20 Add '-13' to each side of the equation. 13 + -13 + b = 20 + -13 Combine like terms: 13 + -13 = 0 0 + b = 20 + -13 b = 20 + -13 Combine like terms: 20 + -13 = 7 b = 7 Simplifying b = 7
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