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Simplifying -7b + 20 = -4 + -9b Reorder the terms: 20 + -7b = -4 + -9b Solving 20 + -7b = -4 + -9b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '9b' to each side of the equation. 20 + -7b + 9b = -4 + -9b + 9b Combine like terms: -7b + 9b = 2b 20 + 2b = -4 + -9b + 9b Combine like terms: -9b + 9b = 0 20 + 2b = -4 + 0 20 + 2b = -4 Add '-20' to each side of the equation. 20 + -20 + 2b = -4 + -20 Combine like terms: 20 + -20 = 0 0 + 2b = -4 + -20 2b = -4 + -20 Combine like terms: -4 + -20 = -24 2b = -24 Divide each side by '2'. b = -12 Simplifying b = -12
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