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Simplifying 2b + 15 = -21 + -1b + -6b Reorder the terms: 15 + 2b = -21 + -1b + -6b Combine like terms: -1b + -6b = -7b 15 + 2b = -21 + -7b Solving 15 + 2b = -21 + -7b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '7b' to each side of the equation. 15 + 2b + 7b = -21 + -7b + 7b Combine like terms: 2b + 7b = 9b 15 + 9b = -21 + -7b + 7b Combine like terms: -7b + 7b = 0 15 + 9b = -21 + 0 15 + 9b = -21 Add '-15' to each side of the equation. 15 + -15 + 9b = -21 + -15 Combine like terms: 15 + -15 = 0 0 + 9b = -21 + -15 9b = -21 + -15 Combine like terms: -21 + -15 = -36 9b = -36 Divide each side by '9'. b = -4 Simplifying b = -4
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