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Simplifying -420 = -20(-3b) Remove parenthesis around (-3b) -420 = -20 * -3b Multiply -20 * -3 -420 = 60b Solving -420 = 60b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-60b' to each side of the equation. -420 + -60b = 60b + -60b Combine like terms: 60b + -60b = 0 -420 + -60b = 0 Add '420' to each side of the equation. -420 + 420 + -60b = 0 + 420 Combine like terms: -420 + 420 = 0 0 + -60b = 0 + 420 -60b = 0 + 420 Combine like terms: 0 + 420 = 420 -60b = 420 Divide each side by '-60'. b = -7 Simplifying b = -7
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