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Simplifying 81 = -5(1 + -3b) + -4 81 = (1 * -5 + -3b * -5) + -4 81 = (-5 + 15b) + -4 Reorder the terms: 81 = -5 + -4 + 15b Combine like terms: -5 + -4 = -9 81 = -9 + 15b Solving 81 = -9 + 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. 81 + -15b = -9 + 15b + -15b Combine like terms: 15b + -15b = 0 81 + -15b = -9 + 0 81 + -15b = -9 Add '-81' to each side of the equation. 81 + -81 + -15b = -9 + -81 Combine like terms: 81 + -81 = 0 0 + -15b = -9 + -81 -15b = -9 + -81 Combine like terms: -9 + -81 = -90 -15b = -90 Divide each side by '-15'. b = 6 Simplifying b = 6
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