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Simplifying 12 + -9b = -20 + -7b Solving 12 + -9b = -20 + -7b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '7b' to each side of the equation. 12 + -9b + 7b = -20 + -7b + 7b Combine like terms: -9b + 7b = -2b 12 + -2b = -20 + -7b + 7b Combine like terms: -7b + 7b = 0 12 + -2b = -20 + 0 12 + -2b = -20 Add '-12' to each side of the equation. 12 + -12 + -2b = -20 + -12 Combine like terms: 12 + -12 = 0 0 + -2b = -20 + -12 -2b = -20 + -12 Combine like terms: -20 + -12 = -32 -2b = -32 Divide each side by '-2'. b = 16 Simplifying b = 16
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