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Simplifying -21 = -3(b + 10) Reorder the terms: -21 = -3(10 + b) -21 = (10 * -3 + b * -3) -21 = (-30 + -3b) Solving -21 = -30 + -3b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '3b' to each side of the equation. -21 + 3b = -30 + -3b + 3b Combine like terms: -3b + 3b = 0 -21 + 3b = -30 + 0 -21 + 3b = -30 Add '21' to each side of the equation. -21 + 21 + 3b = -30 + 21 Combine like terms: -21 + 21 = 0 0 + 3b = -30 + 21 3b = -30 + 21 Combine like terms: -30 + 21 = -9 3b = -9 Divide each side by '3'. b = -3 Simplifying b = -3
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