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Simplifying -7(1 + -6b) + 4 = 81 (1 * -7 + -6b * -7) + 4 = 81 (-7 + 42b) + 4 = 81 Reorder the terms: -7 + 4 + 42b = 81 Combine like terms: -7 + 4 = -3 -3 + 42b = 81 Solving -3 + 42b = 81 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 42b = 81 + 3 Combine like terms: -3 + 3 = 0 0 + 42b = 81 + 3 42b = 81 + 3 Combine like terms: 81 + 3 = 84 42b = 84 Divide each side by '42'. b = 2 Simplifying b = 2
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