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Simplifying 30 + -13b = 8b + -138 Reorder the terms: 30 + -13b = -138 + 8b Solving 30 + -13b = -138 + 8b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-8b' to each side of the equation. 30 + -13b + -8b = -138 + 8b + -8b Combine like terms: -13b + -8b = -21b 30 + -21b = -138 + 8b + -8b Combine like terms: 8b + -8b = 0 30 + -21b = -138 + 0 30 + -21b = -138 Add '-30' to each side of the equation. 30 + -30 + -21b = -138 + -30 Combine like terms: 30 + -30 = 0 0 + -21b = -138 + -30 -21b = -138 + -30 Combine like terms: -138 + -30 = -168 -21b = -168 Divide each side by '-21'. b = 8 Simplifying b = 8
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