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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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