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Simplifying 18b + -21 = 15b + 13 Reorder the terms: -21 + 18b = 15b + 13 Reorder the terms: -21 + 18b = 13 + 15b Solving -21 + 18b = 13 + 15b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-15b' to each side of the equation. -21 + 18b + -15b = 13 + 15b + -15b Combine like terms: 18b + -15b = 3b -21 + 3b = 13 + 15b + -15b Combine like terms: 15b + -15b = 0 -21 + 3b = 13 + 0 -21 + 3b = 13 Add '21' to each side of the equation. -21 + 21 + 3b = 13 + 21 Combine like terms: -21 + 21 = 0 0 + 3b = 13 + 21 3b = 13 + 21 Combine like terms: 13 + 21 = 34 3b = 34 Divide each side by '3'. b = 11.33333333 Simplifying b = 11.33333333
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