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Simplifying -90 = -5(-3b) Remove parenthesis around (-3b) -90 = -5 * -3b Multiply -5 * -3 -90 = 15b Solving -90 = 15b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-15b' to each side of the equation. -90 + -15b = 15b + -15b Combine like terms: 15b + -15b = 0 -90 + -15b = 0 Add '90' to each side of the equation. -90 + 90 + -15b = 0 + 90 Combine like terms: -90 + 90 = 0 0 + -15b = 0 + 90 -15b = 0 + 90 Combine like terms: 0 + 90 = 90 -15b = 90 Divide each side by '-15'. b = -6 Simplifying b = -6
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