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Simplifying -84 = -21b Solving -84 = -21b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '21b' to each side of the equation. -84 + 21b = -21b + 21b Combine like terms: -21b + 21b = 0 -84 + 21b = 0 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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