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Simplifying b + 4(b + -1) = 21 Reorder the terms: b + 4(-1 + b) = 21 b + (-1 * 4 + b * 4) = 21 b + (-4 + 4b) = 21 Reorder the terms: -4 + b + 4b = 21 Combine like terms: b + 4b = 5b -4 + 5b = 21 Solving -4 + 5b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 5b = 21 + 4 Combine like terms: -4 + 4 = 0 0 + 5b = 21 + 4 5b = 21 + 4 Combine like terms: 21 + 4 = 25 5b = 25 Divide each side by '5'. b = 5 Simplifying b = 5
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