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Simplifying -720 = -20(-4b) Remove parenthesis around (-4b) -720 = -20 * -4b Multiply -20 * -4 -720 = 80b Solving -720 = 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. -720 + -80b = 80b + -80b Combine like terms: 80b + -80b = 0 -720 + -80b = 0 Add '720' to each side of the equation. -720 + 720 + -80b = 0 + 720 Combine like terms: -720 + 720 = 0 0 + -80b = 0 + 720 -80b = 0 + 720 Combine like terms: 0 + 720 = 720 -80b = 720 Divide each side by '-80'. b = -9 Simplifying b = -9
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