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⇒ 7/(3-√12) × (3+√12)/(3+√12)
⇒ 21 + √ 84 / 9 + √36 - √36 - √144
⇒ 21 + √ 21.4 / 9 - 12
⇒ 21 + √21.√4 / -3
⇒ 21+ 2√21 / -3