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Simplifying 20b + -1(84 + -1b) = 0 20b + (84 * -1 + -1b * -1) = 0 20b + (-84 + 1b) = 0 Reorder the terms: -84 + 20b + 1b = 0 Combine like terms: 20b + 1b = 21b -84 + 21b = 0 Solving -84 + 21b = 0 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '84' to each side of the equation. -84 + 84 + 21b = 0 + 84 Combine like terms: -84 + 84 = 0 0 + 21b = 0 + 84 21b = 0 + 84 Combine like terms: 0 + 84 = 84 21b = 84 Divide each side by '21'. b = 4 Simplifying b = 4
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