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Simplifying 5b + -1(-1b + 3) = 21 Reorder the terms: 5b + -1(3 + -1b) = 21 5b + (3 * -1 + -1b * -1) = 21 5b + (-3 + 1b) = 21 Reorder the terms: -3 + 5b + 1b = 21 Combine like terms: 5b + 1b = 6b -3 + 6b = 21 Solving -3 + 6b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 6b = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 6b = 21 + 3 6b = 21 + 3 Combine like terms: 21 + 3 = 24 6b = 24 Divide each side by '6'. b = 4 Simplifying b = 4
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