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Simplifying (9b + -7) + -4(2b + 4) = -4 Reorder the terms: (-7 + 9b) + -4(2b + 4) = -4 Remove parenthesis around (-7 + 9b) -7 + 9b + -4(2b + 4) = -4 Reorder the terms: -7 + 9b + -4(4 + 2b) = -4 -7 + 9b + (4 * -4 + 2b * -4) = -4 -7 + 9b + (-16 + -8b) = -4 Reorder the terms: -7 + -16 + 9b + -8b = -4 Combine like terms: -7 + -16 = -23 -23 + 9b + -8b = -4 Combine like terms: 9b + -8b = 1b -23 + 1b = -4 Solving -23 + 1b = -4 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '23' to each side of the equation. -23 + 23 + 1b = -4 + 23 Combine like terms: -23 + 23 = 0 0 + 1b = -4 + 23 1b = -4 + 23 Combine like terms: -4 + 23 = 19 1b = 19 Divide each side by '1'. b = 19 Simplifying b = 19
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