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Simplifying (9b + 7) + -1(8b + 2) = -4 Reorder the terms: (7 + 9b) + -1(8b + 2) = -4 Remove parenthesis around (7 + 9b) 7 + 9b + -1(8b + 2) = -4 Reorder the terms: 7 + 9b + -1(2 + 8b) = -4 7 + 9b + (2 * -1 + 8b * -1) = -4 7 + 9b + (-2 + -8b) = -4 Reorder the terms: 7 + -2 + 9b + -8b = -4 Combine like terms: 7 + -2 = 5 5 + 9b + -8b = -4 Combine like terms: 9b + -8b = 1b 5 + 1b = -4 Solving 5 + 1b = -4 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 1b = -4 + -5 Combine like terms: 5 + -5 = 0 0 + 1b = -4 + -5 1b = -4 + -5 Combine like terms: -4 + -5 = -9 1b = -9 Divide each side by '1'. b = -9 Simplifying b = -9
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