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Simplifying -120 = -10(-3b) Remove parenthesis around (-3b) -120 = -10 * -3b Multiply -10 * -3 -120 = 30b Solving -120 = 30b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-30b' to each side of the equation. -120 + -30b = 30b + -30b Combine like terms: 30b + -30b = 0 -120 + -30b = 0 Add '120' to each side of the equation. -120 + 120 + -30b = 0 + 120 Combine like terms: -120 + 120 = 0 0 + -30b = 0 + 120 -30b = 0 + 120 Combine like terms: 0 + 120 = 120 -30b = 120 Divide each side by '-30'. b = -4 Simplifying b = -4
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