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Simplifying -400 = -20(-4b) Remove parenthesis around (-4b) -400 = -20 * -4b Multiply -20 * -4 -400 = 80b Solving -400 = 80b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-80b' to each side of the equation. -400 + -80b = 80b + -80b Combine like terms: 80b + -80b = 0 -400 + -80b = 0 Add '400' to each side of the equation. -400 + 400 + -80b = 0 + 400 Combine like terms: -400 + 400 = 0 0 + -80b = 0 + 400 -80b = 0 + 400 Combine like terms: 0 + 400 = 400 -80b = 400 Divide each side by '-80'. b = -5 Simplifying b = -5
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