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Simplifying -640 = -20(-4b) Remove parenthesis around (-4b) -640 = -20 * -4b Multiply -20 * -4 -640 = 80b Solving -640 = 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. -640 + -80b = 80b + -80b Combine like terms: 80b + -80b = 0 -640 + -80b = 0 Add '640' to each side of the equation. -640 + 640 + -80b = 0 + 640 Combine like terms: -640 + 640 = 0 0 + -80b = 0 + 640 -80b = 0 + 640 Combine like terms: 0 + 640 = 640 -80b = 640 Divide each side by '-80'. b = -8 Simplifying b = -8
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