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Simplifying 3b + 9 = (-7 + -1b) Reorder the terms: 9 + 3b = (-7 + -1b) Remove parenthesis around (-7 + -1b) 9 + 3b = -7 + -1b Solving 9 + 3b = -7 + -1b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add 'b' to each side of the equation. 9 + 3b + b = -7 + -1b + b Combine like terms: 3b + b = 4b 9 + 4b = -7 + -1b + b Combine like terms: -1b + b = 0 9 + 4b = -7 + 0 9 + 4b = -7 Add '-9' to each side of the equation. 9 + -9 + 4b = -7 + -9 Combine like terms: 9 + -9 = 0 0 + 4b = -7 + -9 4b = -7 + -9 Combine like terms: -7 + -9 = -16 4b = -16 Divide each side by '4'. b = -4 Simplifying b = -4
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