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Simplifying 18 + 15b = 13b + -20 Reorder the terms: 18 + 15b = -20 + 13b Solving 18 + 15b = -20 + 13b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-13b' to each side of the equation. 18 + 15b + -13b = -20 + 13b + -13b Combine like terms: 15b + -13b = 2b 18 + 2b = -20 + 13b + -13b Combine like terms: 13b + -13b = 0 18 + 2b = -20 + 0 18 + 2b = -20 Add '-18' to each side of the equation. 18 + -18 + 2b = -20 + -18 Combine like terms: 18 + -18 = 0 0 + 2b = -20 + -18 2b = -20 + -18 Combine like terms: -20 + -18 = -38 2b = -38 Divide each side by '2'. b = -19 Simplifying b = -19
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