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Simplifying -2(b + -5) = 21 Reorder the terms: -2(-5 + b) = 21 (-5 * -2 + b * -2) = 21 (10 + -2b) = 21 Solving 10 + -2b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + -2b = 21 + -10 Combine like terms: 10 + -10 = 0 0 + -2b = 21 + -10 -2b = 21 + -10 Combine like terms: 21 + -10 = 11 -2b = 11 Divide each side by '-2'. b = -5.5 Simplifying b = -5.5
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