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Simplifying 2b + -21 = 9 + 7b Reorder the terms: -21 + 2b = 9 + 7b Solving -21 + 2b = 9 + 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. -21 + 2b + -7b = 9 + 7b + -7b Combine like terms: 2b + -7b = -5b -21 + -5b = 9 + 7b + -7b Combine like terms: 7b + -7b = 0 -21 + -5b = 9 + 0 -21 + -5b = 9 Add '21' to each side of the equation. -21 + 21 + -5b = 9 + 21 Combine like terms: -21 + 21 = 0 0 + -5b = 9 + 21 -5b = 9 + 21 Combine like terms: 9 + 21 = 30 -5b = 30 Divide each side by '-5'. b = -6 Simplifying b = -6
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