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Simplifying -120 = -20(-2b) Remove parenthesis around (-2b) -120 = -20 * -2b Multiply -20 * -2 -120 = 40b Solving -120 = 40b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-40b' to each side of the equation. -120 + -40b = 40b + -40b Combine like terms: 40b + -40b = 0 -120 + -40b = 0 Add '120' to each side of the equation. -120 + 120 + -40b = 0 + 120 Combine like terms: -120 + 120 = 0 0 + -40b = 0 + 120 -40b = 0 + 120 Combine like terms: 0 + 120 = 120 -40b = 120 Divide each side by '-40'. b = -3 Simplifying b = -3
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