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Simplifying -320 = -20(-4b) Remove parenthesis around (-4b) -320 = -20 * -4b Multiply -20 * -4 -320 = 80b Solving -320 = 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. -320 + -80b = 80b + -80b Combine like terms: 80b + -80b = 0 -320 + -80b = 0 Add '320' to each side of the equation. -320 + 320 + -80b = 0 + 320 Combine like terms: -320 + 320 = 0 0 + -80b = 0 + 320 -80b = 0 + 320 Combine like terms: 0 + 320 = 320 -80b = 320 Divide each side by '-80'. b = -4 Simplifying b = -4
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