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Simplifying 5b + -7(3 + -7b) = -399 5b + (3 * -7 + -7b * -7) = -399 5b + (-21 + 49b) = -399 Reorder the terms: -21 + 5b + 49b = -399 Combine like terms: 5b + 49b = 54b -21 + 54b = -399 Solving -21 + 54b = -399 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 54b = -399 + 21 Combine like terms: -21 + 21 = 0 0 + 54b = -399 + 21 54b = -399 + 21 Combine like terms: -399 + 21 = -378 54b = -378 Divide each side by '54'. b = -7 Simplifying b = -7
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