root 21x-2x+1÷root 21
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21x-2x+1÷√21
19x+1÷√21
multiplying √21 to numerator and denominator:
(19x +1)√21÷√21×√21
399x +√21÷21
19x+1÷√21
multiplying √21 to numerator and denominator:
(19x +1)√21÷√21×√21
399x +√21÷21
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