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Simplifying -840 = -30(-4b) Remove parenthesis around (-4b) -840 = -30 * -4b Multiply -30 * -4 -840 = 120b Solving -840 = 120b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-120b' to each side of the equation. -840 + -120b = 120b + -120b Combine like terms: 120b + -120b = 0 -840 + -120b = 0 Add '840' to each side of the equation. -840 + 840 + -120b = 0 + 840 Combine like terms: -840 + 840 = 0 0 + -120b = 0 + 840 -120b = 0 + 840 Combine like terms: 0 + 840 = 840 -120b = 840 Divide each side by '-120'. b = -7 Simplifying b = -7
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