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Simplifying 13 = -13b + 4b Combine like terms: -13b + 4b = -9b 13 = -9b Solving 13 = -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. 13 + 9b = -9b + 9b Combine like terms: -9b + 9b = 0 13 + 9b = 0 Add '-13' to each side of the equation. 13 + -13 + 9b = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 9b = 0 + -13 9b = 0 + -13 Combine like terms: 0 + -13 = -13 9b = -13 Divide each side by '9'. b = -1.444444444 Simplifying b = -1.444444444
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