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Simplifying -20 = -5(3 + -1b) -20 = (3 * -5 + -1b * -5) -20 = (-15 + 5b) Solving -20 = -15 + 5b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-5b' to each side of the equation. -20 + -5b = -15 + 5b + -5b Combine like terms: 5b + -5b = 0 -20 + -5b = -15 + 0 -20 + -5b = -15 Add '20' to each side of the equation. -20 + 20 + -5b = -15 + 20 Combine like terms: -20 + 20 = 0 0 + -5b = -15 + 20 -5b = -15 + 20 Combine like terms: -15 + 20 = 5 -5b = 5 Divide each side by '-5'. b = -1 Simplifying b = -1
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