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Simplifying -13 = -1(-7 + b) -13 = (-7 * -1 + b * -1) -13 = (7 + -1b) Solving -13 = 7 + -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 = 7 + -1b + b Combine like terms: -1b + b = 0 -13 + b = 7 + 0 -13 + b = 7 Add '13' to each side of the equation. -13 + 13 + b = 7 + 13 Combine like terms: -13 + 13 = 0 0 + b = 7 + 13 b = 7 + 13 Combine like terms: 7 + 13 = 20 b = 20 Simplifying b = 20
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