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Simplifying -4(b + -5) = -21 Reorder the terms: -4(-5 + b) = -21 (-5 * -4 + b * -4) = -21 (20 + -4b) = -21 Solving 20 + -4b = -21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -4b = -21 + -20 Combine like terms: 20 + -20 = 0 0 + -4b = -21 + -20 -4b = -21 + -20 Combine like terms: -21 + -20 = -41 -4b = -41 Divide each side by '-4'. b = 10.25 Simplifying b = 10.25
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