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Simplifying -3(b + -5) = -21 Reorder the terms: -3(-5 + b) = -21 (-5 * -3 + b * -3) = -21 (15 + -3b) = -21 Solving 15 + -3b = -21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -3b = -21 + -15 Combine like terms: 15 + -15 = 0 0 + -3b = -21 + -15 -3b = -21 + -15 Combine like terms: -21 + -15 = -36 -3b = -36 Divide each side by '-3'. b = 12 Simplifying b = 12
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