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Simplifying 138 = 2b + 25 + -1(-7b) Remove parenthesis around (-7b) 138 = 2b + 25 + -1 * -7b Multiply -1 * -7 138 = 2b + 25 + 7b Reorder the terms: 138 = 25 + 2b + 7b Combine like terms: 2b + 7b = 9b 138 = 25 + 9b Solving 138 = 25 + 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. 138 + -9b = 25 + 9b + -9b Combine like terms: 9b + -9b = 0 138 + -9b = 25 + 0 138 + -9b = 25 Add '-138' to each side of the equation. 138 + -138 + -9b = 25 + -138 Combine like terms: 138 + -138 = 0 0 + -9b = 25 + -138 -9b = 25 + -138 Combine like terms: 25 + -138 = -113 -9b = -113 Divide each side by '-9'. b = 12.55555556 Simplifying b = 12.55555556
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